github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-06 05:27:07 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

Browse Source 
commit c0bcdbdff3 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2016-01-18 14:12:40 +01:00 committed by Greg Kroah-Hartman
parent dafa57ee81
commit 66bd949b3a
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/core/control.c
View File

@ -1405,6 +1405,8 @@ static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
return -EFAULT;
if (tlv.length < sizeof(unsigned int) * 2)
return -EINVAL;
if (!tlv.numid)
return -EINVAL;
down_read(&card->controls_rwsem);
kctl = snd_ctl_find_numid(card, tlv.numid);
if (kctl == NULL) {