From: Zubin Mithra zsm@chromium.org
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 --- sound/core/pcm_lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1736,7 +1736,7 @@ static int snd_pcm_lib_ioctl_fifo_size(s 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; }