From: Eric Dumazet Date: Thu, 10 Jun 2021 16:00:12 +0000 (-0700) Subject: net/packet: annotate data race in packet_sendmsg() X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=f57132a887ea4be3d7d813b5003d56716ba33448;p=linux-block.git net/packet: annotate data race in packet_sendmsg() [ Upstream commit d1b5bee4c8be01585033be9b3a8878789285285f ] There is a known race in packet_sendmsg(), addressed in commit 32d3182cd2cd ("net/packet: fix race in tpacket_snd()") Now we have data_race(), we can use it to avoid a future KCSAN warning, as syzbot loves stressing af_packet sockets :) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ddb68aa836f7..7892d7074847 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3033,10 +3033,13 @@ static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) struct sock *sk = sock->sk; struct packet_sock *po = pkt_sk(sk); - if (po->tx_ring.pg_vec) + /* Reading tx_ring.pg_vec without holding pg_vec_lock is racy. + * tpacket_snd() will redo the check safely. + */ + if (data_race(po->tx_ring.pg_vec)) return tpacket_snd(po, msg); - else - return packet_snd(sock, msg, len); + + return packet_snd(sock, msg, len); } /*