Re: [PATCH 6.6 v3 3/3] tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 9da49aa80d686582bc3a027112a30484c9be6b6e

WARNING: Author mismatch between patch and upstream commit:
Backport author: =?utf-8?q?Ricardo_Ca=C3=B1uelo_Navarro?=<rcn@igalia.com>
Commit author: Jeongjun Park<aha310510@gmail.com>

Note: The patch differs from the upstream commit:
---
1:  9da49aa80d686 ! 1:  f295380a77d57 tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()
    @@ Metadata
      ## Commit message ##
         tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()
     
    +    [ Upstream commit 9da49aa80d686582bc3a027112a30484c9be6b6e ]
    +
         There are cases where do_xdp_generic returns bpf_net_context without
         clearing it. This causes various memory corruptions, so the missing
         bpf_net_ctx_clear must be added.
    @@ Commit message
         Reported-by: syzbot+61a1cfc2b6632363d319@syzkaller.appspotmail.com
         Reported-by: syzbot+709e4c85c904bcd62735@syzkaller.appspotmail.com
         Signed-off-by: David S. Miller <davem@davemloft.net>
    +    [rcn: trivial backport edit to adapt the patch context.]
    +    Signed-off-by: Ricardo Cañuelo Navarro <rcn@igalia.com>
     
      ## net/core/dev.c ##
    -@@ net/core/dev.c: int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff **pskb)
    +@@ net/core/dev.c: int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb)
      			bpf_net_ctx_clear(bpf_net_ctx);
      			return XDP_DROP;
      		}
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |