kconfig: recursive checks drop file/lineno
This prevents segfault when getting filename and lineno in recursive checks. If the following snippet is found in Kconfig: [Test code 1] config FOO bool depends on BAR select BAR ... without BAR defined; then there is a segfault. Kconfig:34:error: recursive dependency detected! Kconfig:34: symbol FOO depends on BAR make[4]: *** [scripts/kconfig/Makefile:85: allnoconfig] Segmentation fault This is because of the following. BAR is a fake entry created by sym_lookup() with prop being NULL. In the recursive check, there is a NULL check for prop to fall back to stack->sym->prop if stack->prop is NULL. However, in this case, stack->sym points to the fake BAR entry created by sym_lookup(), so prop is still NULL. prop was then referenced without additional NULL checks, causing segfault. As the previous email thread suggests, the file and lineno for select is also wrong: [Test code 2] config FOO bool config BAR bool config FOO bool "FOO" depends on BAR select BAR $ make defconfig *** Default configuration is based on 'x86_64_defconfig' Kconfig:1:error: recursive dependency detected! Kconfig:1: symbol FOO depends on BAR Kconfig:4: symbol BAR is selected by FOO [...] Kconfig:4 should be Kconfig:10. This patch deletes the wrong and segfault-prone filename/lineno inference completely. With this patch, Test code 1 yields: error: recursive dependency detected! symbol FOO depends on BAR symbol BAR is selected by FOO Signed-off-by: HONG Yifan <elsk@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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@ -1074,10 +1074,9 @@ static void sym_check_print_recursive(struct symbol *last_sym)
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{
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{
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struct dep_stack *stack;
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struct dep_stack *stack;
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struct symbol *sym, *next_sym;
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struct symbol *sym, *next_sym;
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struct menu *menu = NULL;
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struct menu *choice;
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struct menu *choice;
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struct property *prop;
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struct dep_stack cv_stack;
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struct dep_stack cv_stack;
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enum prop_type type;
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choice = sym_get_choice_menu(last_sym);
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choice = sym_get_choice_menu(last_sym);
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if (choice) {
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if (choice) {
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@ -1096,53 +1095,36 @@ static void sym_check_print_recursive(struct symbol *last_sym)
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for (; stack; stack = stack->next) {
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for (; stack; stack = stack->next) {
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sym = stack->sym;
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sym = stack->sym;
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next_sym = stack->next ? stack->next->sym : last_sym;
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next_sym = stack->next ? stack->next->sym : last_sym;
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prop = stack->prop;
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type = stack->prop ? stack->prop->type : P_UNKNOWN;
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if (prop == NULL)
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prop = stack->sym->prop;
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/* for choice values find the menu entry (used below) */
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if (sym_is_choice(sym) || sym_is_choice_value(sym)) {
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for (prop = sym->prop; prop; prop = prop->next) {
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menu = prop->menu;
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if (prop->menu)
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break;
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}
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}
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if (stack->sym == last_sym)
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if (stack->sym == last_sym)
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fprintf(stderr, "%s:%d:error: recursive dependency detected!\n",
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fprintf(stderr, "error: recursive dependency detected!\n");
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prop->filename, prop->lineno);
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if (sym_is_choice(next_sym)) {
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if (sym_is_choice(next_sym)) {
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choice = list_first_entry(&next_sym->menus, struct menu, link);
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choice = list_first_entry(&next_sym->menus, struct menu, link);
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fprintf(stderr, "%s:%d:\tsymbol %s is part of choice block at %s:%d\n",
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fprintf(stderr, "\tsymbol %s is part of choice block at %s:%d\n",
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menu->filename, menu->lineno,
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sym->name ? sym->name : "<choice>",
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sym->name ? sym->name : "<choice>",
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choice->filename, choice->lineno);
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choice->filename, choice->lineno);
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} else if (stack->expr == &sym->dir_dep.expr) {
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} else if (stack->expr == &sym->dir_dep.expr) {
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fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n",
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fprintf(stderr, "\tsymbol %s depends on %s\n",
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prop->filename, prop->lineno,
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sym->name ? sym->name : "<choice>",
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sym->name ? sym->name : "<choice>",
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next_sym->name);
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next_sym->name);
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} else if (stack->expr == &sym->rev_dep.expr) {
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} else if (stack->expr == &sym->rev_dep.expr) {
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fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
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fprintf(stderr, "\tsymbol %s is selected by %s\n",
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prop->filename, prop->lineno,
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sym->name, next_sym->name);
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sym->name, next_sym->name);
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} else if (stack->expr == &sym->implied.expr) {
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} else if (stack->expr == &sym->implied.expr) {
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fprintf(stderr, "%s:%d:\tsymbol %s is implied by %s\n",
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fprintf(stderr, "\tsymbol %s is implied by %s\n",
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prop->filename, prop->lineno,
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sym->name, next_sym->name);
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sym->name, next_sym->name);
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} else if (stack->expr) {
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} else if (stack->expr) {
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fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n",
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fprintf(stderr, "\tsymbol %s %s value contains %s\n",
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prop->filename, prop->lineno,
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sym->name ? sym->name : "<choice>",
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sym->name ? sym->name : "<choice>",
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prop_get_type_name(prop->type),
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prop_get_type_name(type),
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next_sym->name);
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next_sym->name);
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} else {
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} else {
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fprintf(stderr, "%s:%d:\tsymbol %s %s is visible depending on %s\n",
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fprintf(stderr, "\tsymbol %s %s is visible depending on %s\n",
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prop->filename, prop->lineno,
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sym->name ? sym->name : "<choice>",
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sym->name ? sym->name : "<choice>",
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prop_get_type_name(prop->type),
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prop_get_type_name(type),
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next_sym->name);
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next_sym->name);
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}
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}
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}
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}
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@ -1,38 +1,38 @@
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Kconfig:5:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:5: symbol A depends on A
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symbol A depends on A
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:11:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:11: symbol B is selected by B
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symbol B is selected by B
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:17:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:17: symbol C1 depends on C2
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symbol C1 depends on C2
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Kconfig:21: symbol C2 depends on C1
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symbol C2 depends on C1
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:27:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:27: symbol D1 depends on D2
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symbol D1 depends on D2
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Kconfig:32: symbol D2 is selected by D1
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symbol D2 is selected by D1
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:37:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:37: symbol E1 depends on E2
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symbol E1 depends on E2
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Kconfig:42: symbol E2 is implied by E1
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symbol E2 is implied by E1
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:49:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:49: symbol F1 default value contains F2
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symbol F1 default value contains F2
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Kconfig:51: symbol F2 depends on F1
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symbol F2 depends on F1
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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Kconfig:60:error: recursive dependency detected!
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error: recursive dependency detected!
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Kconfig:60: symbol G depends on G
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symbol G depends on G
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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For a resolution refer to Documentation/kbuild/kconfig-language.rst
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subsection "Kconfig recursive dependency limitations"
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subsection "Kconfig recursive dependency limitations"
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