5.15-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit c31e72d021db2714df03df6c42855a1db592716c ]
The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with __inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler().
Then, oreq should be passed to reqsk_put() instead of req; otherwise use-after-free of nreq could happen when reqsk is migrated but the retry attempt failed (e.g. due to timeout).
Let's pass oreq to reqsk_put().
Fixes: e8c526f2bdf1 ("tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().") Reported-by: Liu Jian liujian56@huawei.com Closes: https://lore.kernel.org/netdev/1284490f-9525-42ee-b7b8-ccadf6606f6d@huawei.c... Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Vadim Fedorenko vadim.fedorenko@linux.dev Reviewed-by: Liu Jian liujian56@huawei.com Reviewed-by: Eric Dumazet edumazet@google.com Reviewed-by: Martin KaFai Lau martin.lau@kernel.org Link: https://patch.msgid.link/20241123174236.62438-1-kuniyu@amazon.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv4/inet_connection_sock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 63e5aa6d4b0bc..73ef8b4f57049 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -935,7 +935,7 @@ static void reqsk_timer_handler(struct timer_list *t)
drop: __inet_csk_reqsk_queue_drop(sk_listener, oreq, true); - reqsk_put(req); + reqsk_put(oreq); }
static bool reqsk_queue_hash_req(struct request_sock *req,