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gnrc_udp: fix #3707

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This commit is contained in:
Martine Lenders 2015-08-25 18:12:05 +02:00
parent 8a07f8c548
commit f81f43ea38
1 changed files with 24 additions and 3 deletions
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27
sys/net/gnrc/transport_layer/udp/gnrc_udp.c
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@ -139,13 +139,34 @@ static void _receive(gnrc_pktsnip_t *pkt)
static void _send(gnrc_pktsnip_t *pkt) static void _send(gnrc_pktsnip_t *pkt)
{ {
udp_hdr_t *hdr; udp_hdr_t *hdr;
gnrc_pktsnip_t *udp_snip; gnrc_pktsnip_t *udp_snip, *tmp;
/* get udp snip and hdr */ /* write protect first header */
LL_SEARCH_SCALAR(pkt, udp_snip, type, GNRC_NETTYPE_UDP); tmp = gnrc_pktbuf_start_write(pkt);
if (tmp == NULL) {
DEBUG("udp: cannot send packet: unable to allocate packet\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
udp_snip = tmp->next;
/* get and write protect until udp snip */
while ((udp_snip != NULL) && (udp_snip->type != GNRC_NETTYPE_UDP)) {
udp_snip = gnrc_pktbuf_start_write(udp_snip);
if (udp_snip == NULL) {
DEBUG("udp: cannot send packet: unable to allocate packet\n");
gnrc_pktbuf_release(pkt);
return;
}
tmp->next = udp_snip;
tmp = udp_snip;
udp_snip = udp_snip->next;
}
assert(udp_snip != NULL); assert(udp_snip != NULL);
/* write protect UDP snip */
udp_snip = gnrc_pktbuf_start_write(udp_snip); udp_snip = gnrc_pktbuf_start_write(udp_snip);
if (udp_snip == NULL) { if (udp_snip == NULL) {
DEBUG("udp: cannot send packet: unable to allocate packet\n"); DEBUG("udp: cannot send packet: unable to allocate packet\n");