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ALSA: pcm: fix divide error in snd_pcm_lib_ioctl

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commit f3eef46f05 upstream.

Syzkaller reported a divide error in snd_pcm_lib_ioctl. fifo_size
is of type snd_pcm_uframes_t(unsigned long). If frame_size
is 0x100000000, the error occurs.

Fixes: a9960e6a29 ("ALSA: pcm: fix fifo_size frame calculation")
Signed-off-by: Zubin Mithra <zsm@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210827153735.789452-1-zsm@chromium.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zubin Mithra 2021-08-27 08:37:35 -07:00 • committed by Greg Kroah-Hartman
parent 5f9aadda1d
commit d789944b05
1 changed files with 1 additions and 1 deletions
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2
sound/core/pcm_lib.c
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@ -1746,7 +1746,7 @@ static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
channels = params_channels(params);
frame_size = snd_pcm_format_size(format, channels);
if (frame_size > 0)
params->fifo_size /= (unsigned)frame_size;
params->fifo_size /= frame_size;
}
return 0;
}