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c-ares NAPTR parser out of bounds access #13897

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c-ares NAPTR parser out of bounds access #13897

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7 changes: 6 additions & 1 deletion deps/cares/src/ares_parse_naptr_reply.c
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,12 @@ ares_parse_naptr_reply (const unsigned char *abuf, int alen,
status = ARES_EBADRESP;
break;
}
/* RR must contain at least 7 bytes = 2 x int16 + 3 x name */
if (rr_len < 7)
{
status = ARES_EBADRESP;
break;
}

/* Check if we are really looking at a NAPTR record */
if (rr_class == C_IN && rr_type == T_NAPTR)
Expand Down Expand Up @@ -185,4 +191,3 @@ ares_parse_naptr_reply (const unsigned char *abuf, int alen,

return ARES_SUCCESS;
}