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net: check the existence of peer before trying to pad

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There could be case that peer is NULL. This can happen when during
network device hot-add where net device needs to be added first. So
the patch check the existence of peer before trying to do the pad.

Fixes: 969e50b61a ("net: Pad short frames to minimum size before sending from SLiRP/TAP")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Message-id: 20210423031803.1479-1-jasowang@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jason Wang 2021-04-23 11:18:03 +08:00 • committed by Peter Maydell
parent b1cffefa1b
commit bc38e31b4e
4 changed files with 8 additions and 3 deletions
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2
net/tap-win32.c
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@ -696,7 +696,7 @@ static void tap_win32_send(void *opaque)
if (size > 0) {
orig_buf = buf;
if (!s->nc.peer->do_not_pad) {
if (net_peer_needs_padding(&s->nc)) {
if (eth_pad_short_frame(min_pkt, &min_pktsz, buf, size)) {
buf = min_pkt;
size = min_pktsz;