[PATCH 3.19.y-ckt 029/196] ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check

From: Kamal Mostafa
Date: Tue Mar 08 2016 - 20:18:08 EST

3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know.


From: Takashi Iwai <tiwai@xxxxxxx>

commit cc85f7a634cfaf9f0713c6aa06d08817424db37a upstream.

NULL user-space buffer can be passed even in a normal path, thus it's
not good to spew a kernel warning with stack trace at each time.
Just drop snd_BUG_ON() macro usage there.

BugLink: http://lkml.kernel.org/r/CACT4Y+YfVJ3L+q0i-4vyQVyyPD7V=OMX0PWPi29x9Bo3QaBLdw@xxxxxxxxxxxxxx
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
sound/core/rawmidi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 6fc71a4..1d9dbed 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1188,7 +1188,7 @@ static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
long count1, result;
struct snd_rawmidi_runtime *runtime = substream->runtime;

- if (snd_BUG_ON(!kernelbuf && !userbuf))
+ if (!kernelbuf && !userbuf)
return -EINVAL;
if (snd_BUG_ON(!runtime->buffer))
return -EINVAL;