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From: Zubin Mithra <>
Cc:,, Zubin Mithra <>
Subject: [PATCH v2] ALSA: pcm: fix divide error in snd_pcm_lib_ioctl
Date: Fri, 27 Aug 2021 08:37:35 -0700	[thread overview]
Message-ID: <> (raw)

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 <>
 sound/core/pcm_lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;

             reply	other threads:[~2021-08-27 15:38 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-27 15:37 Zubin Mithra [this message]
2021-08-27 16:34 ` [PATCH v2] ALSA: pcm: fix divide error in snd_pcm_lib_ioctl Guenter Roeck
2021-08-27 20:34 ` Takashi Iwai

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