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gnrc_sixlowpan_iphc: fix null pointer dereference in _iphc_encode()

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Felix 2022-09-23 18:58:07 +02:00 committed by Martine Lenders
parent 9728f727e7
commit 639c04325d
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1 changed files with 5 additions and 0 deletions
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5
sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c
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@ -1650,6 +1650,11 @@ static gnrc_pktsnip_t *_iphc_encode(gnrc_pktsnip_t *pkt,
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC_NHC
while (_compressible_nh(nh)) {
ssize_t local_pos = 0;
if (pkt->next->next == NULL) {
DEBUG("6lo iphc: packet next header missing data");
gnrc_pktbuf_release(dispatch);
return NULL;
}
switch (nh) {
case PROTNUM_UDP:
local_pos = _nhc_udp_encode_snip(pkt, &iphc_hdr[inline_pos]);