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authorTakashi Iwai <tiwai@suse.de>2016-01-12 14:38:02 +0300
committerTakashi Iwai <tiwai@suse.de>2016-01-12 19:21:48 +0300
commit030e2c78d3a91dd0d27fef37e91950dde333eba1 (patch)
treed98816c29d7f5d56428897d83e9174952408114a /sound
parent5c06d68bc2a174a6b82dce9f100f55173b9a5189 (diff)
downloadlinux-030e2c78d3a91dd0d27fef37e91950dde333eba1.tar.xz
ALSA: seq: Fix missing NULL check at remove_events ioctl
snd_seq_ioctl_remove_events() calls snd_seq_fifo_clear() unconditionally even if there is no FIFO assigned, and this leads to an Oops due to NULL dereference. The fix is just to add a proper NULL check. Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/seq/seq_clientmgr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index b64f20deba90..13cfa815732d 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1962,7 +1962,7 @@ static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
* No restrictions so for a user client we can clear
* the whole fifo
*/
- if (client->type == USER_CLIENT)
+ if (client->type == USER_CLIENT && client->data.user.fifo)
snd_seq_fifo_clear(client->data.user.fifo);
}