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authorTakashi Iwai <tiwai@suse.de>2023-09-15 11:28:02 +0300
committerTakashi Iwai <tiwai@suse.de>2023-09-15 14:22:16 +0300
commit5f6af0050a7a6f8d7972267ddd3a75970e13931e (patch)
tree607da9c7b93f46062985c3afef8e4eb19777a96f /sound
parent28329936d1e2ff4b962daca1c943f0150890d51e (diff)
downloadlinux-5f6af0050a7a6f8d7972267ddd3a75970e13931e.tar.xz
ALSA: hda: generic: Check potential mixer name string truncation
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/hda_generic.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index dbf7aa88e0e3..bf685d01259d 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -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;