4.9-stable review patch. If anyone has any objections, please let me know.
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From: Lorenzo Colitti lorenzo@google.com
[ Upstream commit acc2cf4e37174646a24cba42fa53c668b2338d4e ]
When tcp_diag_destroy closes a TCP_NEW_SYN_RECV socket, it first frees it by calling inet_csk_reqsk_queue_drop_and_and_put in tcp_abort, and then frees it again by calling sock_gen_put.
Since tcp_abort only has one caller, and all the other codepaths in tcp_abort don't free the socket, just remove the free in that function.
Cc: David Ahern dsa@cumulusnetworks.com Tested: passes Android sock_diag_test.py, which exercises this codepath Fixes: d7226c7a4dd1 ("net: diag: Fix refcnt leak in error path destroying socket") Signed-off-by: Lorenzo Colitti lorenzo@google.com Signed-off-by: Eric Dumazet edumazet@google.com Reviewed-by: David Ahern dsa@cumulusnetworks.com Tested-by: David Ahern dsa@cumulusnetworks.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/tcp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3238,8 +3238,7 @@ int tcp_abort(struct sock *sk, int err) struct request_sock *req = inet_reqsk(sk);
local_bh_disable(); - inet_csk_reqsk_queue_drop_and_put(req->rsk_listener, - req); + inet_csk_reqsk_queue_drop(req->rsk_listener, req); local_bh_enable(); return 0; }