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Fix memory leak in _nss_dns_gethostbyname4_r with big DNS answer

This commit is contained in:
Andreas Schwab 2014-02-13 11:01:57 +01:00
parent 743151aeae
commit d668061994
3 changed files with 17 additions and 3 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-02-13 Andreas Schwab <schwab@suse.de>
[BZ #16574]
* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyname4_r): Free the
second answer buffer if it was separately allocated.
2014-02-12 Joseph Myers <joseph@codesourcery.com>
* sysdeps/mips/math-tests.h: Include <features.h>.

2
NEWS
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@ -9,7 +9,7 @@ Version 2.20
* The following bugs are resolved with this release:
15894, 16447, 16545.
15894, 16447, 16545, 16574.
* The am33 port, which had not worked for several years, has been removed
from ports.

12
resolv/nss_dns/dns-host.c
View File

@ -298,13 +298,14 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
name = cp;
}
int anslen = 2048;
union
{
querybuf *buf;
u_char *ptr;
} host_buffer;
querybuf *orig_host_buffer;
host_buffer.buf = orig_host_buffer = (querybuf *) alloca (2048);
host_buffer.buf = orig_host_buffer = (querybuf *) alloca (anslen);
u_char *ans2p = NULL;
int nans2p = 0;
int resplen2 = 0;
@ -312,7 +313,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
int olderr = errno;
enum nss_status status;
int n = __libc_res_nsearch (&_res, name, C_IN, T_UNSPEC,
host_buffer.buf->buf, 2048, &host_buffer.ptr,
host_buffer.buf->buf, anslen, &host_buffer.ptr,
&ans2p, &nans2p, &resplen2);
if (n < 0)
{
@ -352,6 +353,13 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
resplen2, name, pat, buffer, buflen,
errnop, herrnop, ttlp);
/* Check whether ans2p was separately allocated. */
if (host_buffer.buf != orig_host_buffer)
anslen = MAXPACKET;
if (ans2p != NULL
&& (ans2p < host_buffer.ptr || ans2p >= host_buffer.ptr + anslen))
free (ans2p);
if (host_buffer.buf != orig_host_buffer)
free (host_buffer.buf);