diff options
| author | Bo Chen <chenbo@pdx.edu> | 2018-05-31 15:35:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-26 07:53:59 +0800 |
| commit | 3e935514ed33c286ebe191dedd4b1aadfe3020da (patch) | |
| tree | e786f290cb8bbe290f5c4457d5e16d2650440c6c /tools/perf/scripts/python | |
| parent | 33b863293a1a7686281b989920bc88367ebdc870 (diff) | |
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/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions