ALSA: core: add isascii() check to card ID generator
The card identifier should contain only safe ASCII characters. The isalnum() returns true also for characters for non-ASCII characters. Link: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/4135 Link: https://lore.kernel.org/linux-sound/yk3WTvKkwheOon_LzZlJ43PPInz6byYfBzpKkbasww1yzuiMRqn7n6Y8vZcXB-xwFCu_vb8hoNjv7DTNwH5TWjpEuiVsyn9HPCEXqwF4120=@protonmail.com/ Cc: stable@vger.kernel.org Reported-by: Barnabás Pőcze <pobrn@protonmail.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://patch.msgid.link/20241002194649.1944696-1-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -654,13 +654,19 @@ void snd_card_free(struct snd_card *card)
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}
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EXPORT_SYMBOL(snd_card_free);
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/* check, if the character is in the valid ASCII range */
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static inline bool safe_ascii_char(char c)
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{
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return isascii(c) && isalnum(c);
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}
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/* retrieve the last word of shortname or longname */
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static const char *retrieve_id_from_card_name(const char *name)
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{
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const char *spos = name;
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while (*name) {
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if (isspace(*name) && isalnum(name[1]))
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if (isspace(*name) && safe_ascii_char(name[1]))
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spos = name + 1;
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name++;
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}
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@ -687,12 +693,12 @@ static void copy_valid_id_string(struct snd_card *card, const char *src,
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{
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char *id = card->id;
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while (*nid && !isalnum(*nid))
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while (*nid && !safe_ascii_char(*nid))
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nid++;
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if (isdigit(*nid))
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*id++ = isalpha(*src) ? *src : 'D';
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while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
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if (isalnum(*nid))
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if (safe_ascii_char(*nid))
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*id++ = *nid;
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nid++;
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}
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@ -787,7 +793,7 @@ static ssize_t id_store(struct device *dev, struct device_attribute *attr,
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for (idx = 0; idx < copy; idx++) {
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c = buf[idx];
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if (!isalnum(c) && c != '_' && c != '-')
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if (!safe_ascii_char(c) && c != '_' && c != '-')
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return -EINVAL;
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}
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memcpy(buf1, buf, copy);
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