ALSA: hda - potential (but unlikely) uninitialized variable
This function is a bit unusual because it accepts negative values as
"conn_len". It's theoretically possible for both "cache_len" and
"conn_len" to be -ENOSPC and in that case we would oops trying to run
memcmp() on the uninitialized "list" pointer.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index ee62307..baaf7ed0 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -582,8 +582,8 @@
/* Get Cache connections info */
cache_len = snd_hda_get_conn_list(codec, nid, &list);
- if (cache_len != conn_len
- || memcmp(list, conn, conn_len)) {
+ if (cache_len >= 0 && (cache_len != conn_len ||
+ memcmp(list, conn, conn_len) != 0)) {
snd_iprintf(buffer, " In-driver Connection: %d\n", cache_len);
if (cache_len > 0) {
snd_iprintf(buffer, " ");
