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gnrc/ipv6: fix: Overflow in sent packet

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xnumad 2024-06-18 20:04:08 +02:00
parent 1e4a85f1e6
commit 81a1e997f0
1 changed files with 8 additions and 2 deletions
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10
sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
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@ -111,8 +111,14 @@ static gnrc_pktsnip_t *_offl_to_pio(_nib_offl_entry_t *offl,
uint8_t flags = 0;
uint32_t valid_ltime = (offl->valid_until == UINT32_MAX) ? UINT32_MAX :
((offl->valid_until - now) / MS_PER_SEC);
uint32_t pref_ltime = (offl->pref_until == UINT32_MAX) ? UINT32_MAX :
((offl->pref_until - now) / MS_PER_SEC);
uint32_t pref_ltime = offl->pref_until;
if (pref_ltime != UINT32_MAX) { /* reserved for infinite lifetime */
if (pref_ltime >= now) { /* avoid overflow */
pref_ltime = (pref_ltime - now) / MS_PER_SEC;
} else {
pref_ltime = 0; /* deprecated */
}
}
DEBUG("nib: Build PIO for %s/%u\n",
ipv6_addr_to_str(addr_str, &offl->pfx, sizeof(addr_str)),