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af_packet: fix the SO_SNDTIMEO constraint not effective on tpacked_snd()

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commit c1ba3c0cbdb5e53a8ec5d708e99cd4c497028a13 upstream.

Due to the changes in commit 581073f626e3 ("af_packet: do not call
packet_read_pending() from tpacket_destruct_skb()"), every time
tpacket_destruct_skb() is executed, the skb_completion is marked as
completed. When wait_for_completion_interruptible_timeout() returns
completed, the pending_refcnt has not yet been reduced to zero.
Therefore, when ph is NULL, the wait function may need to be called
multiple times until packet_read_pending() finally returns zero.

We should call sock_sndtimeo() only once, otherwise the SO_SNDTIMEO
constraint could be way off.

Fixes: 581073f626e3 ("af_packet: do not call packet_read_pending() from tpacket_destruct_skb()")
Cc: stable@kernel.org
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yun Lu <luyun@kylinos.cn>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yun Lu 2025-07-11 17:32:59 +08:00 • committed by Greg Kroah-Hartman
commit aabd21a25a
1 changed files with 2 additions and 2 deletions
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4
net/packet/af_packet.c
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@ -2713,7 +2713,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
int len_sum = 0;
int status = TP_STATUS_AVAILABLE;
int hlen, tlen, copylen = 0;
long timeo = 0;
long timeo;
mutex_lock(&po->pg_vec_lock);
@ -2767,6 +2767,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
size_max = dev->mtu + reserve + VLAN_HLEN;
timeo = sock_sndtimeo(&po->sk, msg->msg_flags & MSG_DONTWAIT);
reinit_completion(&po->skb_completion);
do {
@ -2774,7 +2775,6 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
TP_STATUS_SEND_REQUEST);
if (unlikely(ph == NULL)) {
if (need_wait && skb) {
timeo = sock_sndtimeo(&po->sk, msg->msg_flags & MSG_DONTWAIT);
timeo = wait_for_completion_interruptible_timeout(&po->skb_completion, timeo);
if (timeo <= 0) {
err = !timeo ? -ETIMEDOUT : -ERESTARTSYS;