Fix the out of bounds access in media_entity_init() found by KASan. This is a result of media_mixer_init() failing to allocate memory for all 3 of its pads before calling media_entity_init(). Fix it to allocate memory for the right struct media_mixer_ctl instead of struct media_ctl.

Signed-off-by: Shuah Khan shuahkh@osg.samsung.com ---

This patch fixes the mixer patch below: https://patchwork.linuxtv.org/patch/31827/

sound/usb/media.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/usb/media.c b/sound/usb/media.c index bebe27b..0cb44b9 100644 --- a/sound/usb/media.c +++ b/sound/usb/media.c @@ -233,8 +233,8 @@ int media_mixer_init(struct snd_usb_audio *chip) if (mixer->media_mixer_ctl) continue;

- /* allocate media_ctl */ - mctl = kzalloc(sizeof(struct media_ctl), GFP_KERNEL); + /* allocate media_mixer_ctl */ + mctl = kzalloc(sizeof(struct media_mixer_ctl), GFP_KERNEL); if (!mctl) return -ENOMEM;

@@ -244,6 +244,7 @@ int media_mixer_init(struct snd_usb_audio *chip) mctl->media_pad[0].flags = MEDIA_PAD_FL_SINK; mctl->media_pad[1].flags = MEDIA_PAD_FL_SOURCE; mctl->media_pad[2].flags = MEDIA_PAD_FL_SOURCE; + media_entity_init(&mctl->media_entity, MEDIA_MIXER_PAD_MAX, mctl->media_pad); ret = media_device_register_entity(mctl->media_dev,