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Fix assertion failures in resolver (BZ #13013).

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[BZ #13013]
	* resolv/res_query.c(__libc_res_nquery): Assign hp and hp2
	depending n and resplen2 to catch cases where answer
	equals answerp2.
This commit is contained in:
Aurelien Jarno 2012-11-30 15:04:27 -05:00 committed by David S. Miller
parent b062e14ff3
commit cc8bb21c8a
3 changed files with 25 additions and 18 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2011-11-30 Aurelien Jarno <aurel32@debian.org>
[BZ #13013]
* resolv/res_query.c(__libc_res_nquery): Assign hp and hp2
depending n and resplen2 to catch cases where answer
equals answerp2.
2012-11-29 Carlos O'Donell <carlos@systemhalted.org>
* elf/get-dynamic-info.h (elf_get_dynamic_info): Warn

4
NEWS
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@ -10,8 +10,8 @@ Version 2.17
* The following bugs are resolved with this release:
1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
9685, 9914, 10014, 10038, 10631, 10873, 11438, 11607, 11638, 11741,
12140, 13412, 13542, 13601, 13603, 13604, 13629, 13679, 13696, 13698,
9685, 9914, 10014, 10038, 10631, 10873, 11438, 11607, 11638, 11741, 12140,
13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679, 13696, 13698,
13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950, 13952, 13966,
14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157, 14166, 14173,
14195, 14197, 14237, 14251, 14252, 14283, 14298, 14303, 14307, 14328,

32
resolv/res_query.c
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@ -122,6 +122,7 @@ __libc_res_nquery(res_state statp,
int *resplen2)
{
HEADER *hp = (HEADER *) answer;
HEADER *hp2;
int n, use_malloc = 0;
u_int oflags = statp->_flags;
@ -239,25 +240,24 @@ __libc_res_nquery(res_state statp,
/* __libc_res_nsend might have reallocated the buffer. */
hp = (HEADER *) *answerp;
/* We simplify the following tests by assigning HP to HP2. It
is easy to verify that this is the same as ignoring all
tests of HP2. */
HEADER *hp2 = answerp2 ? (HEADER *) *answerp2 : hp;
if (n < (int) sizeof (HEADER) && answerp2 != NULL
&& *resplen2 > (int) sizeof (HEADER))
/* We simplify the following tests by assigning HP to HP2 or
vice versa. It is easy to verify that this is the same as
ignoring all tests of HP or HP2. */
if (answerp2 == NULL || *resplen2 < (int) sizeof (HEADER))
{
/* Special case of partial answer. */
assert (hp != hp2);
hp = hp2;
}
else if (answerp2 != NULL && *resplen2 < (int) sizeof (HEADER)
&& n > (int) sizeof (HEADER))
{
/* Special case of partial answer. */
assert (hp != hp2);
hp2 = hp;
}
else
{
hp2 = (HEADER *) *answerp2;
if (n < (int) sizeof (HEADER))
{
hp = hp2;
}
}
/* Make sure both hp and hp2 are defined */
assert((hp != NULL) && (hp2 != NULL));
if ((hp->rcode != NOERROR || ntohs(hp->ancount) == 0)
&& (hp2->rcode != NOERROR || ntohs(hp2->ancount) == 0)) {