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dhcp6: make sure we have enough space for the DHCP6 option header

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Fixes a vulnerability originally discovered by Felix Wilhelm from
Google.

CVE-2018-15688
LP: #1795921
https://bugzilla.redhat.com/show_bug.cgi?id=1639067

(cherry picked from commit 4dac5eaba4e419b29c97da38a8b1f82336c2c892)
This commit is contained in:
Lennart Poettering 2018-10-19 12:12:33 +02:00 • committed by Thomas Haller
parent 05872d554f
commit 01ca2053bb
1 changed files with 1 additions and 1 deletions
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2
src/systemd/src/libsystemd-network/dhcp6-option.c
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@ -108,7 +108,7 @@ int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, const DHCP6IA *ia) {
return -EINVAL;
}
if (*buflen < len)
if (*buflen < offsetof(DHCP6Option, data) + len)
return -ENOBUFS;
ia_hdr = *buf;