diff options
| author | Fabio M. De Francesco <fmdefrancesco@gmail.com> | 2022-04-09 03:26:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-20 09:08:32 +0200 |
| commit | c3b2f23bfe5452b00eb1c842bc71098449e4ad9f (patch) | |
| tree | 7e6f26d77302bf4983059f39590f1b521c9ff2d3 | |
| parent | 846737e63cfe7ee81788c4ca9babe0d3bf687677 (diff) | |
ALSA: pcm: Test for "silence" field in struct "pcm_format_data"
commit 2f7a26abb8241a0208c68d22815aa247c5ddacab upstream.
Syzbot reports "KASAN: null-ptr-deref Write in
snd_pcm_format_set_silence".[1]
It is due to missing validation of the "silence" field of struct
"pcm_format_data" in "pcm_formats" array.
Add a test for valid "pat" and, if it is not so, return -EINVAL.
[1] https://lore.kernel.org/lkml/000000000000d188ef05dc2c7279@google.com/
Reported-and-tested-by: syzbot+205eb15961852c2c5974@syzkaller.appspotmail.com
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220409012655.9399-1-fmdefrancesco@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | sound/core/pcm_misc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index 9be81025372f..8412d1cbd009 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -406,7 +406,7 @@ int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int return 0; width = pcm_formats[(INT)format].phys; /* physical width */ pat = pcm_formats[(INT)format].silence; - if (! width) + if (!width || !pat) return -EINVAL; /* signed or 1 byte data */ if (pcm_formats[(INT)format].signd == 1 || width <= 8) { |