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| author | Lennart Poettering <lennart@poettering.net> | 2020-11-10 14:52:25 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2021-02-14 23:05:38 +0100 |
| commit | 894c7b77081e8eba8d78722624cc145f87ae95ac (patch) | |
| tree | f84b47ed6012fa14b223047c77035f58f441537d /src | |
| parent | resolved: gracefully handle with packets with too large RR count (diff) | |
| download | systemd-894c7b77081e8eba8d78722624cc145f87ae95ac.tar.xz systemd-894c7b77081e8eba8d78722624cc145f87ae95ac.zip | |
resolved: gracefully handle trailing packet garbage
Similar to the previous commit: if we see trailing garbage in a DNS
packet, let's assume EDNS is borked too, and suppress it.
Diffstat (limited to 'src')
| -rw-r--r-- | src/resolve/resolved-dns-packet.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c index 953d5fa337..f548bbf9f2 100644 --- a/src/resolve/resolved-dns-packet.c +++ b/src/resolve/resolved-dns-packet.c @@ -2394,6 +2394,12 @@ int dns_packet_extract(DnsPacket *p) { if (r < 0) return r; + if (p->rindex < p->size) { + log_debug("Trailing garbage in packet, suppressing OPT."); + p->opt = dns_resource_record_unref(p->opt); + p->opt_start = p->opt_size = SIZE_MAX; + } + p->question = TAKE_PTR(question); p->answer = TAKE_PTR(answer); |