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.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
sound/pci/hda/hda_generic.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
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;
--
2.35.3
