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gnrc_sixlowpan_iphc: fix NULL pointer dereference

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This commit is contained in:
Martine Lenders 2023-05-30 14:27:13 +02:00
parent e690ef4c12
commit c9d7863e56
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GPG Key ID: 2134D77A5336DD80
1 changed files with 15 additions and 1 deletions
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16
sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c
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@ -1074,12 +1074,18 @@ static size_t _iphc_ipv6_encode(gnrc_pktsnip_t *pkt,
uint8_t *iphc_hdr)
{
gnrc_sixlowpan_ctx_t *src_ctx = NULL, *dst_ctx = NULL;
ipv6_hdr_t *ipv6_hdr = pkt->next->data;
ipv6_hdr_t *ipv6_hdr;
bool addr_comp = false;
uint16_t inline_pos = SIXLOWPAN_IPHC_HDR_LEN;
assert(iface != NULL);
if (pkt->next == NULL) {
DEBUG("6lo iphc: packet missing header\n");
return 0;
}
ipv6_hdr = pkt->next->data;
/* set initial dispatch value*/
iphc_hdr[IPHC1_IDX] = SIXLOWPAN_IPHC1_DISP;
iphc_hdr[IPHC2_IDX] = 0;
@ -1742,6 +1748,14 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
gnrc_sixlowpan_multiplex_by_size(tmp, orig_datagram_size, netif, page);
}
else {
if (IS_USED(MODULE_GNRC_SIXLOWPAN_FRAG_MINFWD)) {
gnrc_sixlowpan_frag_fb_t *fb = ctx;
if (fb->pkt == pkt) {
/* free provided fragmentation buffer */
fb->pkt = NULL;
}
}
gnrc_pktbuf_release(pkt);
}
}