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| author | Bo Chen <chenbo@pdx.edu> | 2018-06-01 01:35:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 12:21:25 +0300 |
| commit | 9f1592e4a0464f9676b068ee4463f9d24553d52c (patch) | |
| tree | 833329ad083760448def755f0fc863f8b7fba277 /tools | |
| parent | d85feb4259a2f234950c3ee0f493a855adef900b (diff) | |
| download | linux-9f1592e4a0464f9676b068ee4463f9d24553d52c.tar.xz | |
ALSA: hda - Handle kzalloc() failure in snd_hda_attach_pcm_stream()
commit a3aa60d511746bd6c0d0366d4eb90a7998bcde8b upstream.
When 'kzalloc()' fails in 'snd_hda_attach_pcm_stream()', a new pcm instance is
created without setting its operators via 'snd_pcm_set_ops()'. Following
operations on the new pcm instance can trigger kernel null pointer dereferences
and cause kernel oops.
This bug was found with my work on building a gray-box fault-injection tool for
linux-kernel-module binaries. A kernel null pointer dereference was confirmed
from line 'substream->ops->open()' in function 'snd_pcm_open_substream()' in
file 'sound/core/pcm_native.c'.
This patch fixes the bug by calling 'snd_device_free()' in the error handling
path of 'kzalloc()', which removes the new pcm instance from the snd card before
returns with an error code.
Signed-off-by: Bo Chen <chenbo@pdx.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions