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net: check the existence of peer before trying to pad 

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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5
include/net/net.h
View File

@ -241,4 +241,9 @@ uint32_t net_crc32_le(const uint8_t *p, int len);
.offset = vmstate_offset_macaddr(_state, _field), \
}
static inline bool net_peer_needs_padding(NetClientState *nc)
{
return nc->peer && !nc->peer->do_not_pad;
}
#endif

2
net/slirp.c
View File

@ -119,7 +119,7 @@ static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
uint8_t min_pkt[ETH_ZLEN];
size_t min_pktsz = sizeof(min_pkt);
if (!s->nc.peer->do_not_pad) {
if (net_peer_needs_padding(&s->nc)) {
if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) {
pkt = min_pkt;
pkt_len = min_pktsz;

2
net/tap-win32.c
View File

@ -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;

2
net/tap.c
View File

@ -203,7 +203,7 @@ static void tap_send(void *opaque)
size -= s->host_vnet_hdr_len;
}
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;