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Avoid infinite loop in nss_dns getnetbyname [BZ #17630]

This commit is contained in:
Florian Weimer 2014-12-15 17:41:13 +01:00
parent ae61fc7b33
commit 11e3417af6
3 changed files with 13 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-12-16 Florian Weimer <fweimer@redhat.com>
[BZ #17630]
* resolv/nss_dns/dns-network.c (getanswer_r): Iterate over alias
names.
2014-12-16 Allan McRae <allan@archlinux.org> 2014-12-16 Allan McRae <allan@archlinux.org>
* stdio-common/Makefile (tests): Re-add bug26. * stdio-common/Makefile (tests): Re-add bug26.

7
NEWS
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@ -13,8 +13,8 @@ Version 2.21
15884, 16469, 16617, 16619, 16657, 16740, 16857, 17192, 17266, 17344, 15884, 16469, 16617, 16619, 16657, 16740, 16857, 17192, 17266, 17344,
17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508,
17522, 17555, 17570, 17571, 17572, 17573, 17574, 17581, 17582, 17583, 17522, 17555, 17570, 17571, 17572, 17573, 17574, 17581, 17582, 17583,
17584, 17585, 17589, 17594, 17601, 17608, 17616, 17625, 17633, 17634, 17584, 17585, 17589, 17594, 17601, 17608, 17616, 17625, 17630, 17633,
17647, 17653, 17657, 17664, 17665, 17668, 17682. 17634, 17647, 17653, 17657, 17664, 17665, 17668, 17682.
* CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
under certain input conditions resulting in the execution of a shell for under certain input conditions resulting in the execution of a shell for
@ -25,6 +25,9 @@ Version 2.21
* CVE-2012-3406 printf-style functions could run into a stack overflow when * CVE-2012-3406 printf-style functions could run into a stack overflow when
processing format strings with a large number of format specifiers. processing format strings with a large number of format specifiers.
* The nss_dns implementation of getnetbyname could run into an infinite loop
if the DNS response contained a PTR record of an unexpected format.
* The minimum GCC version that can be used to build this version of the GNU * The minimum GCC version that can be used to build this version of the GNU
C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
still be used to compile programs using the GNU C Library. still be used to compile programs using the GNU C Library.

4
resolv/nss_dns/dns-network.c
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@ -398,8 +398,8 @@ getanswer_r (const querybuf *answer, int anslen, struct netent *result,
case BYNAME: case BYNAME:
{ {
char **ap = result->n_aliases++; char **ap;
while (*ap != NULL) for (ap = result->n_aliases; *ap != NULL; ++ap)
{ {
/* Check each alias name for being of the forms: /* Check each alias name for being of the forms:
4.3.2.1.in-addr.arpa = net 1.2.3.4 4.3.2.1.in-addr.arpa = net 1.2.3.4