net/rds: Fix a NULL dereference in rds_tcp_accept_one()

At the beginning of rds_tcp_accept_one(), when sock is NULL it goes
to label "out" where sock is dereferenced "sock->sk" so it is a
NULL dereference. Add a NULL check to avoid NULL dereference.

Orabug: 34371883

Fixes: 1031d5d9f25e ("rds: tcp transport-specific tracepoints")
Signed-off-by: Harshit Mogalapalli <[email protected]>
Reviewed-by: Gerd Rausch <[email protected]>

Author: harshimogalapalli

net/rds/tcp_listen.c

@@ -238,8 +238,8 @@ int rds_tcp_accept_one(struct socket *sock)
 	ret = 0;
 out:
 	if (ret)
-		trace_rds_tcp_accept_err(conn, cp, rs_tcp, sock->sk, reason,
-					 ret);
+		trace_rds_tcp_accept_err(conn, cp, rs_tcp,
+					 sock ? sock->sk : NULL, reason, ret);
 	else
 		trace_rds_tcp_accept(conn, cp, rs_tcp, sock->sk, "accept", ret);
 	if (rs_tcp)