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[PATCH 2.6.32 35/55] ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

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  [PATCH 2.6.32 35/55] ALSA: control: Avoid kernel warnings from tlv ioctl  with numid 0 Willy Tarreau <w@1wt.eu> - 2016-03-04 17:10 +0100

#1350346 — [PATCH 2.6.32 35/55] ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@suse.de>

commit c0bcdbdff3ff73a54161fca3cb8b6cdbd0bb8762 upstream.

When a TLV ioctl with numid zero is handled, the driver may spew a
kernel warning with a stack trace at each call.  The check was
intended obviously only for a kernel driver, but not for a user
interaction.  Let's fix it.

This was spotted by syzkaller fuzzer.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
 sound/core/control.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/control.c b/sound/core/control.c
index ffa7857..e6fcf56 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1130,6 +1130,8 @@ static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
 		return -EFAULT;
 	if (tlv.length < sizeof(unsigned int) * 3)
 		return -EINVAL;
+	if (!tlv.numid)
+		return -EINVAL;
 	down_read(&card->controls_rwsem);
 	kctl = snd_ctl_find_numid(card, tlv.numid);
 	if (kctl == NULL) {
-- 
1.7.12.2.21.g234cd45.dirty

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