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gnrc_sixlowpan: Various hardening fixes [backport 2022.10] #18820

Merged
gnrc_sixlowpan_frag_vrb: Assert no usage of a vrb with src_len == 0
(cherry picked from commit aa27ed7)
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Diff-fusion authored and miri64 committed Oct 29, 2022
commit f4fb746d1acaacc962daeed3aa71aadfe307d20e
Expand Up @@ -53,6 +53,7 @@ gnrc_sixlowpan_frag_vrb_t *gnrc_sixlowpan_frag_vrb_add(
gnrc_sixlowpan_frag_vrb_t *vrbe = NULL;

assert(base != NULL);
assert(base->src_len != 0);
assert(out_netif != NULL);
assert(out_dst != NULL);
assert(out_dst_len > 0);
Expand Down Expand Up @@ -168,6 +169,7 @@ gnrc_sixlowpan_frag_vrb_t *gnrc_sixlowpan_frag_vrb_get(
{
DEBUG("6lo vrb: trying to get entry for (%s, %u)\n",
gnrc_netif_addr_to_str(src, src_len, addr_str), src_tag);
assert(src_len != 0);
for (unsigned i = 0; i < CONFIG_GNRC_SIXLOWPAN_FRAG_VRB_SIZE; i++) {
gnrc_sixlowpan_frag_vrb_t *vrbe = &_vrb[i];

Expand All @@ -189,6 +191,7 @@ gnrc_sixlowpan_frag_vrb_t *gnrc_sixlowpan_frag_vrb_reverse(
{
DEBUG("6lo vrb: trying to get entry for reverse label switching (%s, %u)\n",
gnrc_netif_addr_to_str(src, src_len, addr_str), tag);
assert(src_len != 0);
for (unsigned i = 0; i < CONFIG_GNRC_SIXLOWPAN_FRAG_VRB_SIZE; i++) {
gnrc_sixlowpan_frag_vrb_t *vrbe = &_vrb[i];

Expand Down