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ALSA: core: add isascii() check to card ID generator

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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>
This commit is contained in:
Jaroslav Kysela 2024-10-02 21:46:49 +02:00 committed by Takashi Iwai
parent 33027006ec
commit d278a9de5e
1 changed files with 10 additions and 4 deletions
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14
sound/core/init.c
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@ -654,13 +654,19 @@ void snd_card_free(struct snd_card *card)
}
EXPORT_SYMBOL(snd_card_free);
/* check, if the character is in the valid ASCII range */
static inline bool safe_ascii_char(char c)
{
return isascii(c) && isalnum(c);
}
/* retrieve the last word of shortname or longname */
static const char *retrieve_id_from_card_name(const char *name)
{
const char *spos = name;
while (*name) {
if (isspace(*name) && isalnum(name[1]))
if (isspace(*name) && safe_ascii_char(name[1]))
spos = name + 1;
name++;
}
@ -687,12 +693,12 @@ static void copy_valid_id_string(struct snd_card *card, const char *src,
{
char *id = card->id;
while (*nid && !isalnum(*nid))
while (*nid && !safe_ascii_char(*nid))
nid++;
if (isdigit(*nid))
*id++ = isalpha(*src) ? *src : 'D';
while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
if (isalnum(*nid))
if (safe_ascii_char(*nid))
*id++ = *nid;
nid++;
}
@ -787,7 +793,7 @@ static ssize_t id_store(struct device *dev, struct device_attribute *attr,
for (idx = 0; idx < copy; idx++) {
c = buf[idx];
if (!isalnum(c) && c != '_' && c != '-')
if (!safe_ascii_char(c) && c != '_' && c != '-')
return -EINVAL;
}
memcpy(buf1, buf, copy);