From: Zubin Mithra <zsm@chromium.org> stable inclusion from stable-5.10.63 commit 8e41134a92a50a11ecf7823bc1a19a4dd347463a bugzilla: 182231 https://gitee.com/openeuler/kernel/issues/I4EFS1 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit f3eef46f0518a2b32ca1244015820c35a22cfe4a 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: 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- 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 bda3514c7b2d..5e04c4b9e023 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; } -- 2.20.1