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fix(treesitter): fix another TSNode:tree() double free

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Unfortunately the gc=false objects can refer to a dangling tree if the
gc=true tree was freed first. This reuses the same tree object as the
node itself is keeping alive via the uservalue of the node userdata.
(wrapped in a table due to lua 5.1 restrictions)
This commit is contained in:
bfredl 2023-08-29 11:21:57 +02:00
parent 6e45567b49
commit 50a03c0e99
2 changed files with 25 additions and 11 deletions
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22
src/nvim/lua/treesitter.c
View File

@ -53,7 +53,6 @@ typedef struct {
typedef struct {
TSTree *tree;
bool gc;
} TSLuaTree;
#ifdef INCLUDE_GENERATED_DECLARATIONS
@ -477,13 +476,12 @@ static int parser_parse(lua_State *L)
return luaL_error(L, "An error occurred when parsing.");
}
// The new tree will be pushed to the stack, without copy, ownership is now to
// the lua GC.
// Old tree is still owned by the lua GC.
// The new tree will be pushed to the stack, without copy, ownership is now to the lua GC.
// Old tree is owned by lua GC since before
uint32_t n_ranges = 0;
TSRange *changed = old_tree ? ts_tree_get_changed_ranges(old_tree, new_tree, &n_ranges) : NULL;
push_tree(L, new_tree, true); // [tree]
push_tree(L, new_tree); // [tree]
push_ranges(L, changed, n_ranges, include_bytes); // [tree, ranges]
@ -509,7 +507,7 @@ static int tree_copy(lua_State *L)
}
TSTree *copy = ts_tree_copy(ud->tree);
push_tree(L, copy, true); // [tree]
push_tree(L, copy); // [tree]
return 1;
}
@ -779,8 +777,9 @@ static int parser_get_logger(lua_State *L)
/// push tree interface on lua stack.
///
/// The tree is garbage collected if gc is true
void push_tree(lua_State *L, TSTree *tree, bool gc)
/// The tree is not copied. Ownership of the tree is transfered from c code to
/// lua. if needed use ts_tree_copy() in the caller
void push_tree(lua_State *L, TSTree *tree)
{
if (tree == NULL) {
lua_pushnil(L);
@ -789,7 +788,6 @@ void push_tree(lua_State *L, TSTree *tree, bool gc)
TSLuaTree *ud = lua_newuserdata(L, sizeof(TSLuaTree)); // [udata]
ud->tree = tree;
ud->gc = gc;
lua_getfield(L, LUA_REGISTRYINDEX, TS_META_TREE); // [udata, meta]
lua_setmetatable(L, -2); // [udata]
@ -812,7 +810,7 @@ static TSLuaTree *tree_check(lua_State *L, int index)
static int tree_gc(lua_State *L)
{
TSLuaTree *ud = tree_check(L, 1);
if (ud && ud->gc) {
if (ud) {
ts_tree_delete(ud->tree);
}
return 0;
@ -1322,7 +1320,9 @@ static int node_tree(lua_State *L)
return 0;
}
push_tree(L, (TSTree *)node.tree, false);
lua_getfenv(L, 1); // [udata, reftable]
lua_rawgeti(L, -1, 1); // [udata, reftable, tree_udata]
return 1;
}

14
test/functional/treesitter/node_spec.lua
View File

@ -26,6 +26,20 @@ describe('treesitter node API', function()
assert_alive()
end)
it('double free tree 2', function()
exec_lua([[
parser = vim.treesitter.get_parser(0, "c")
local x = parser:parse()[1]:root():tree()
vim.api.nvim_buf_set_text(0, 0,0, 0,0, {'y'})
parser:parse()
vim.api.nvim_buf_set_text(0, 0,0, 0,1, {'z'})
parser:parse()
collectgarbage()
x:root()
]])
assert_alive()
end)
it('can move between siblings', function()
insert([[
int main(int x, int y, int z) {