| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 21/86] net/packet: fix packet_sock xmit return value checking | Date | Tue, 26 Apr 2022 10:20:49 +0200 |
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From: Hangbin Liu <liuhangbin@gmail.com>
[ Upstream commit 29e8e659f984be00d75ec5fef4e37c88def72712 ]
packet_sock xmit could be dev_queue_xmit, which also returns negative errors. So only checking positive errors is not enough, or userspace sendmsg may return success while packet is not send out.
Move the net_xmit_errno() assignment in the braces as checkpatch.pl said do not use assignment in if condition.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: Flavio Leitner <fbl@redhat.com> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/packet/af_packet.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index d0c95d7dd292..5ee600d108a0 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2817,8 +2817,9 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) status = TP_STATUS_SEND_REQUEST; err = po->xmit(skb); - if (unlikely(err > 0)) { - err = net_xmit_errno(err); + if (unlikely(err != 0)) { + if (err > 0) + err = net_xmit_errno(err); if (err && __packet_get_status(po, ph) == TP_STATUS_AVAILABLE) { /* skb was destructed already */ @@ -3019,8 +3020,12 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) skb->no_fcs = 1; err = po->xmit(skb); - if (err > 0 && (err = net_xmit_errno(err)) != 0) - goto out_unlock; + if (unlikely(err != 0)) { + if (err > 0) + err = net_xmit_errno(err); + if (err) + goto out_unlock; + } dev_put(dev); -- 2.35.1
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