ALSA: pcm: oss: Fix potential out-of-bounds shift

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syzbot spotted a potential out-of-bounds shift in the PCM OSS layer
where it calculates the buffer size with the arbitrary shift value
given via an ioctl.

Add a range check for avoiding the undefined behavior.
As the value can be treated by a signed integer, the max shift should
be 30.

Reported-by: syzbot+df7dc146ebdd6435eea3@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201209084552.17109-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Takashi Iwai 2020-12-09 09:45:52 +01:00

parent 43d5ca88df

commit 175b8d89fe

1 changed files with 5 additions and 1 deletions

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sound/core/oss/pcm_oss.c

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