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net/packet: fix packet_sock xmit return value checking 

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: 1da177e4c3 ("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>
This commit is contained in:
Hangbin Liu 2022-04-14 16:49:25 +08:00 committed by David S. Miller
parent 1a74e99323
commit 29e8e659f9
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/packet/af_packet.c
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@ -2858,8 +2858,9 @@ 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 */
@ -3060,8 +3061,12 @@ 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);