At Fri, 17 Apr 2015 15:35:15 +0300, Dan Carpenter wrote:

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.

Yes, that's a bug. But the check should be rather:

if (cache_len >= 0 && (cache_len != conn_len || memcmp(list, conn, conn_len) != 0))

Could you resend with this fix?

thanks,

Takashi

My static checker complains about this.

Signed-off-by: Dan Carpenter dan.carpenter@oracle.com

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c index ce5a6da..387fdfc 100644 --- a/sound/pci/hda/hda_proc.c +++ b/sound/pci/hda/hda_proc.c @@ -556,8 +556,8 @@ static void print_conn_list(struct snd_info_buffer *buffer,

/* 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, " ");