bpf: tcp: Use sock_gen_put instead of sock_put in bpf_iter_tcp

While reviewing the udp-iter batching patches, noticed the bpf_iter_tcp
calling sock_put() is incorrect. It should call sock_gen_put instead
because bpf_iter_tcp is iterating the ehash table which has the req sk
and tw sk. This patch replaces all sock_put with sock_gen_put in the
bpf_iter_tcp codepath.

Fixes: 04c7820 ("bpf: tcp: Bpf iter batching and lock_sock")
Signed-off-by: Martin KaFai Lau <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Martin KaFai Lau

net/ipv4/tcp_ipv4.c

@@ -2780,7 +2780,7 @@ static int tcp_prog_seq_show(struct bpf_prog *prog, struct bpf_iter_meta *meta,
 static void bpf_iter_tcp_put_batch(struct bpf_tcp_iter_state *iter)
 {
 	while (iter->cur_sk < iter->end_sk)
-		sock_put(iter->batch[iter->cur_sk++]);
+		sock_gen_put(iter->batch[iter->cur_sk++]);
 }
 
 static int bpf_iter_tcp_realloc_batch(struct bpf_tcp_iter_state *iter,
@@ -2941,7 +2941,7 @@ static void *bpf_iter_tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 		 * st->bucket.  See tcp_seek_last_pos().
 		 */
 		st->offset++;
-		sock_put(iter->batch[iter->cur_sk++]);
+		sock_gen_put(iter->batch[iter->cur_sk++]);
 	}
 
 	if (iter->cur_sk < iter->end_sk)