From: eunwoo kim ew.kim@samsung.com

Since snd_pcm_ioctl_sw_params_compat has no runtime variable check, if application call the ioctl after close, it can make kernel crash. So, snd_pcm_ioctl_sw_params_compat needs to check the runtime variable at the beginning of the function.

Signed-off-by: eunwoo kim ew.kim@samsung.com Signed-off-by: Chanho Park chanho61.park@samsung.com --- sound/core/pcm_compat.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 590a46a9e78d..ff0de4252ff4 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -90,6 +90,9 @@ static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream, snd_pcm_uframes_t boundary; int err;

+ if (!substream->runtime) + return -ENOTTY; + memset(&params, 0, sizeof(params)); if (get_user(params.tstamp_mode, &src->tstamp_mode) || get_user(params.period_step, &src->period_step) ||