bpf: tcp: Use sock_gen_put instead of sock_put in bpf_iter_tcp

[ Upstream commit 580031ff9952b7dbf48dedba6b56a100ae002bef ]

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: 04c7820b776f ("bpf: tcp: Bpf iter batching and lock_sock")
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230328004232.2134233-1-martin.lau@linux.dev
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index da46357..ad0a5f1 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2728,7 +2728,7 @@ 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,
@@ -2889,7 +2889,7 @@ 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)