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ALSA: hda: generic: Check potential mixer name string truncation

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add_control_with_pfx() constructs a mixer name element with the fixed
size, and it got compile warnings with -Wformat-truncation.

Although the size overflow is very unlikely, let's have a sanity check
of the string size and returns the error if it really doesn't fit
instead of silent truncation.

Link: https://lore.kernel.org/r/20230915082802.28684-14-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-09-15 10:28:02 +02:00
parent 28329936d1
commit 5f6af0050a
1 changed files with 5 additions and 1 deletions
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6
sound/pci/hda/hda_generic.c
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@ -998,7 +998,11 @@ static int add_control_with_pfx(struct hda_gen_spec *spec, int type,
const char *sfx, int cidx, unsigned long val)
{
char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
snprintf(name, sizeof(name), "%s %s %s", pfx, dir, sfx);
int len;
len = snprintf(name, sizeof(name), "%s %s %s", pfx, dir, sfx);
if (snd_BUG_ON(len >= sizeof(name)))
return -EINVAL;
if (!add_control(spec, type, name, cidx, val))
return -ENOMEM;
return 0;