On Thu, 17 Mar 2016 03:58:06 +0100,
Shuah Khan wrote:
>
> media_snd_stream_delete() fails to release resources during unbind. This
> leads to use-after-free in media_gobj_create() on a subsequent bind.
>
> [ 1445.086410] BUG: KASAN: use-after-free in media_gobj_create+0x3a1/0x470 [media] at addr ffff8801ead49998
>
> [ 1445.086771] Call Trace:
> [ 1445.086779] [<ffffffff81ade373>] dump_stack+0x67/0x94
> [ 1445.086785] [<ffffffff81523c29>] print_trailer+0xf9/0x150
> [ 1445.086790] [<ffffffff81529644>] object_err+0x34/0x40
> [ 1445.086796] [<ffffffff8152b9e1>] kasan_report_error+0x221/0x530
> [ 1445.086803] [<ffffffff8152bfb3>] __asan_report_store8_noabort+0x43/0x50
> [ 1445.086813] [<ffffffffa0a79341>] ? media_gobj_create+0x3a1/0x470 [media]
> [ 1445.086822] [<ffffffffa0a79341>] media_gobj_create+0x3a1/0x470 [media]
> [ 1445.086831] [<ffffffffa0a705a9>] media_device_register_entity+0x259/0x6f0 [media]
> [ 1445.086841] [<ffffffffa0a70350>] ? media_device_unregister_entity_notify+0x100/0x100 [media]
> [ 1445.086846] [<ffffffff81526232>] ? ___slab_alloc+0x172/0x500
> [ 1445.086854] [<ffffffff81203548>] ? mark_held_locks+0xc8/0x120
> [ 1445.086859] [<ffffffff81526610>] ? __slab_alloc+0x50/0x70
> [ 1445.086878] [<ffffffffa0fe711c>] ? media_snd_mixer_init+0x16c/0x500 [snd_usb_audio]
> [ 1445.086884] [<ffffffff8152b086>] ? kasan_unpoison_shadow+0x36/0x50
> [ 1445.086890] [<ffffffff8152b086>] ? kasan_unpoison_shadow+0x36/0x50
> [ 1445.086895] [<ffffffff8152b0fe>] ? kasan_kmalloc+0x5e/0x70
>
> Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Mauro, please take it through your tree.
Acked-by: Takashi Iwai <tiwai@xxxxxxx>
thanks,
Takashi
> ---
> sound/usb/media.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/usb/media.c b/sound/usb/media.c
> index 44a5de9..0d03773 100644
> --- a/sound/usb/media.c
> +++ b/sound/usb/media.c
> @@ -135,7 +135,7 @@ void media_snd_stream_delete(struct snd_usb_substream *subs)
> if (mctl && mctl->media_dev) {
> struct media_device *mdev;
>
> - mdev = subs->stream->chip->media_dev;
> + mdev = mctl->media_dev;
> if (mdev && media_devnode_is_registered(&mdev->devnode)) {
> media_devnode_remove(mctl->intf_devnode);
> media_device_unregister_entity(&mctl->media_entity);
> --
> 2.5.0
>
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