[PATCH net] tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()

[Jeongjun Park]

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.

Reported-by: syzbot+44623300f057a28baf1e@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: fecef4cd42c6 ("tun: Assign missing bpf_net_context.")
Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
---
 net/core/dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 6ea1d20676fb..751d9b70e6ad 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5150,6 +5150,7 @@ int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff **pskb)
 			bpf_net_ctx_clear(bpf_net_ctx);
 			return XDP_DROP;
 		}
+		bpf_net_ctx_clear(bpf_net_ctx);
 	}
 	return XDP_PASS;
 out_redir:
--