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Harry N
3d1fedf0aa
I also added an underflow patch, but the attribution prevented the package from building. The patch source is https://src.fedoraproject.org/rpms/dnsmasq/raw/rawhide/f/dnsmasq-2.77-underflow.patch
14 lines
412 B
Diff
14 lines
412 B
Diff
--- src/rfc1035.c.orig
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+++ src/rfc1035.c
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@@ -1624,6 +1624,9 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
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int rd_bit = (header->hb3 & HB3_RD);
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int count = 255; /* catch loops */
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+ // Make sure we do not underflow here too.
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+ if ((ssize_t)qlen > (limit - ((char *)header))) return 0;
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+
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/* Suppress cached answers if no_cache set. */
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if (no_cache)
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rd_bit = 0;
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