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[bpf,v3,5/8] skmsg: fix a memory leak in sk_psock_verdict_apply()

Message ID 20210527011155.10097-6-xiyou.wangcong@gmail.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series sock_map: some bug fixes and improvements | expand

Checks

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netdev/cover_letter success Link
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netdev/tree_selection success Clearly marked for bpf
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netdev/cc_maintainers fail 1 blamed authors not CCed: ast@kernel.org; 8 maintainers not CCed: yhs@fb.com kpsingh@kernel.org andrii@kernel.org kafai@fb.com ast@kernel.org songliubraving@fb.com davem@davemloft.net kuba@kernel.org
netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 13 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
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Commit Message

Cong Wang May 27, 2021, 1:11 a.m. UTC 
From: Cong Wang <cong.wang@bytedance.com>

If the dest psock does not set SK_PSOCK_TX_ENABLED,
the skb can't be queued anywhere so must be dropped.

This one is found during code review.

Fixes: 799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()")
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jakub Sitnicki <jakub@cloudflare.com>
Cc: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
---
 net/core/skmsg.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 4334720e2a04..5464477e2d3d 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -924,8 +924,13 @@  static void sk_psock_verdict_apply(struct sk_psock *psock,
 			if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) {
 				skb_queue_tail(&psock->ingress_skb, skb);
 				schedule_work(&psock->work);
+				err = 0;
 			}
 			spin_unlock_bh(&psock->ingress_lock);
+			if (err < 0) {
+				skb_bpf_redirect_clear(skb);
+				goto out_free;
+			}
 		}
 		break;
 	case __SK_REDIRECT: