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authorZubin Mithra <zsm@chromium.org>2021-08-27 18:37:35 +0300
committerTakashi Iwai <tiwai@suse.de>2021-08-27 23:34:12 +0300
commitf3eef46f0518a2b32ca1244015820c35a22cfe4a (patch)
tree4f5c56b7075f46985196fd7aaf046aca6e7260f2
parent93ab3eafb0b3551c54175cb38afed3b82356a047 (diff)
downloadlinux-f3eef46f0518a2b32ca1244015820c35a22cfe4a.tar.xz
ALSA: pcm: fix divide error in snd_pcm_lib_ioctl
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: a9960e6a293e ("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>
-rw-r--r--sound/core/pcm_lib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 7d5883432085..a144a3f68e9e 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -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;
}