Subject: Re: [PATCH] net: sockmap: Don't call bpf_prog_put() on NULL pointer

From: Jakub Sitnicki <[email-masked]>
Date: Wed, 14 Oct 2020 11:32:45 +0200

On Mon, Oct 12, 2020 at 07:09 PM CEST, Alex Dewar wrote:
> If bpf_prog_inc_not_zero() fails for skb_parser, then bpf_prog_put() is
> called unconditionally on skb_verdict, even though it may be NULL. Fix
> and tidy up error path.
>
> Addresses-Coverity-ID: 1497799: Null pointer dereferences (FORWARD_NULL)
> Fixes: 743df8b7749f ("bpf, sockmap: Check skb_verdict and skb_parser programs explicitly")
> Signed-off-by: Alex Dewar <[email-masked]>
> ---

Note to maintainers: the issue exists only in bpf-next where we have:

  https://lore.kernel.org/bpf/160239294756.8495.5796595770890272219.stgit@john-Precision-5820-Tower/

The patch also looks like it is supposed to be applied on top of the above.