From: Florian Westphal <f...@strlen.de>
Date: Sun, 23 Jul 2017 19:54:47 +0200
> A null check is needed after all. netlink skbs can have skb->head be
> backed by vmalloc. The netlink destructor vfree()s head, then sets it to
> NULL. We then panic in skb_release_data with a NULL dereference.
>
> Re-add such a test.
>
> Alternative would be to switch to kvfree to free skb->head memory
> and remove the special handling in netlink destructor.
>
> Reported-by: kernel test robot <fengguang...@intel.com>
> Fixes: 06dc75ab06943 ("net: Revert "net: add function to allocate sk_buff
> head without data area")
> Signed-off-by: Florian Westphal <f...@strlen.de>
Ok, back it goes.
Applied, thanks.
