linux-kernel - [PATCH] ipv4: fix lock leaks

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Date:   Fri, 21 Jan 2022 11:11:08 +0800
From:   ycaibb <ycaibb@...il.com>
To:     edumazet@...gle.com, davem@...emloft.net, yoshfuji@...ux-ipv6.org,
        dsahern@...nel.org, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, ycaibb@...il.com
Subject: [PATCH] ipv4: fix lock leaks

From: Ryan Cai <ycaibb@...il.com>

In methods listening_get_first and listening_get_first in tcp_ipv4.c, there are lock leaks when seq_sk_match returns true.

Signed-off-by: Ryan Cai <ycaibb@...il.com>
---
 net/ipv4/tcp_ipv4.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 13d868c43284..714107766035 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2329,6 +2329,7 @@ static void *listening_get_first(struct seq_file *seq)
 		inet_lhash2_for_each_icsk(icsk, &ilb2->head) {
 			sk = (struct sock *)icsk;
 			if (seq_sk_match(seq, sk))
+				spin_unlock(&ilb2->lock);
 				return sk;
 		}
 		spin_unlock(&ilb2->lock);
@@ -2407,6 +2408,7 @@ static void *established_get_first(struct seq_file *seq)
 		spin_lock_bh(lock);
 		sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) {
 			if (seq_sk_match(seq, sk))
+				spin_unlock_bh(lock);
 				return sk;
 		}
 		spin_unlock_bh(lock);
-- 
2.33.0