60 lines
1.8 KiB
Diff
60 lines
1.8 KiB
Diff
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2011-07-21 Aurelien Jarno <aurel32@debian.org>
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* resolv/res_query.c(__libc_res_nquery): Assign hp and hp2
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depending n and resplen2 to catch cases where answer
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equals answerp2.
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diff --git a/resolv/res_query.c b/resolv/res_query.c
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index 2f7cfaa..405fa68 100644
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--- a/resolv/res_query.c
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+++ b/resolv/res_query.c
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@@ -122,6 +122,7 @@ __libc_res_nquery(res_state statp,
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int *resplen2)
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{
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HEADER *hp = (HEADER *) answer;
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+ HEADER *hp2;
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int n, use_malloc = 0;
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u_int oflags = statp->_flags;
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@@ -239,26 +240,25 @@ __libc_res_nquery(res_state statp,
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/* __libc_res_nsend might have reallocated the buffer. */
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hp = (HEADER *) *answerp;
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- /* We simplify the following tests by assigning HP to HP2. It
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- is easy to verify that this is the same as ignoring all
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- tests of HP2. */
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- HEADER *hp2 = answerp2 ? (HEADER *) *answerp2 : hp;
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-
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- if (n < (int) sizeof (HEADER) && answerp2 != NULL
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- && *resplen2 > (int) sizeof (HEADER))
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+ /* We simplify the following tests by assigning HP to HP2 or
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+ vice versa. It is easy to verify that this is the same as
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+ ignoring all tests of HP or HP2. */
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+ if (answerp2 == NULL || *resplen2 < (int) sizeof (HEADER))
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{
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- /* Special case of partial answer. */
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- assert (hp != hp2);
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- hp = hp2;
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+ hp2 = hp;
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}
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- else if (answerp2 != NULL && *resplen2 < (int) sizeof (HEADER)
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- && n > (int) sizeof (HEADER))
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+ else
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{
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- /* Special case of partial answer. */
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- assert (hp != hp2);
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- hp2 = hp;
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+ hp2 = (HEADER *) *answerp2;
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+ if (n < (int) sizeof (HEADER))
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+ {
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+ hp = hp2;
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+ }
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}
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+ /* Make sure both hp and hp2 are defined */
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+ assert((hp != NULL) && (hp2 != NULL));
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+
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if ((hp->rcode != NOERROR || ntohs(hp->ancount) == 0)
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&& (hp2->rcode != NOERROR || ntohs(hp2->ancount) == 0)) {
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#ifdef DEBUG
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