ALSA: pcm: Fix UAF in snd_pcm_oss_get_formats()

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commit 01c0b4265c upstream.

snd_pcm_oss_get_formats() has an obvious use-after-free around
snd_mask_test() calls, as spotted by syzbot.  The passed format_mask
argument is a pointer to the hw_params object that is freed before the
loop.  What a surprise that it has been present since the original
code of decades ago...

Reported-by: syzbot+4090700a4f13fccaf648@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Takashi Iwai 2018-03-10 23:04:23 +01:00 • committed by Greg Kroah-Hartman

parent a9cf8b6fe7

commit 5ee6abaa53

1 changed files with 6 additions and 4 deletions

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sound/core/oss/pcm_oss.c

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