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Fix out-of-bounds heap read in order_qsort().

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We only need to order two server records on the ->serial field.
Literal address records are smaller and don't have
this field and don't need to be ordered on it.
To actually provoke this bug seems to need the same server-literal
to be repeated twice, eg --address=/a/1.1.1.1 --address-/a/1.1.1.1
which is clearly rare in the wild, but if it did exist it could
provoke a SIGSEV. Thanks to Daniel Rhea for fuzzing this one.
This commit is contained in:
Simon Kelley
2024-11-21 15:28:31 +00:00
parent 0adaf13438
commit b087cf4a6c
2 changed files with 11 additions and 3 deletions
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4
src/domain-match.c
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@@ -541,9 +541,9 @@ static int order_qsort(const void *a, const void *b)
/* Finally, order by appearance in /etc/resolv.conf etc, for --strict-order */
if (rc == 0)
if (!(s1->flags & SERV_LITERAL_ADDRESS))
if (!(s1->flags & SERV_IS_LOCAL) && !(s2->flags & SERV_IS_LOCAL))
rc = s1->serial - s2->serial;
return rc;
}