net/packet: rx_owner_map depends on pg_vec

[ Upstream commit ec6af094ea28f0f2dda1a6a33b14cd57e36a9755 ]

Packet sockets may switch ring versions. Avoid misinterpreting state
between versions, whose fields share a union. rx_owner_map is only
allocated with a packet ring (pg_vec) and both are swapped together.
If pg_vec is NULL, meaning no packet ring was allocated, then neither
was rx_owner_map. And the field may be old state from a tpacket_v3.

Fixes: 61fad6816fc1 ("net/packet: tpacket_rcv: avoid a producer race condition")
Reported-by: Syzbot <syzbot+1ac0994a0a0c55151121@syzkaller.appspotmail.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20211215143937.106178-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 08144559eed56ea19a5ceb1c2cc349caf1040aea..f78097aa403a8bea058145a29829392b7015661e 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4461,9 +4461,10 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
        }
 
 out_free_pg_vec:
-       bitmap_free(rx_owner_map);
-       if (pg_vec)
+       if (pg_vec) {
+               bitmap_free(rx_owner_map);
                free_pg_vec(pg_vec, order, req->tp_block_nr);
+       }
 out:
        return err;
 }