* [2.28 COMMITTED] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
@ 2018-01-01 0:00 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2018-01-01 0:00 UTC (permalink / raw)
To: libc-stable
From: Mingli Yu <Mingli.Yu@windriver.com>
A NULL value can happen with certain gethostbyname_r failures.
(cherry picked from commit 1214ba06e6771acb953a190091b0f6055c64fd25)
2018-09-20 Mingli Yu <Mingli.Yu@windriver.com>
* sysdeps/unix/sysv/linux/gethostid.c (gethostid): Check for NULL
value from gethostbyname_r.
diff --git a/NEWS b/NEWS
index 2855ffde58..502e0c19f5 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,7 @@ The following bugs are resolved with this release:
[23521] nss_files aliases database file stream leak
[23538] pthread_cond_broadcast: Fix waiters-after-spinning case
[23578] regex: Fix memory overread in re_compile_pattern
+ [23679] gethostid: Missing NULL check for gethostbyname_r result
\f
Version 2.28
diff --git a/sysdeps/unix/sysv/linux/gethostid.c b/sysdeps/unix/sysv/linux/gethostid.c
index 2e20f034dc..ee0190e7f9 100644
--- a/sysdeps/unix/sysv/linux/gethostid.c
+++ b/sysdeps/unix/sysv/linux/gethostid.c
@@ -102,12 +102,12 @@ gethostid (void)
{
int ret = __gethostbyname_r (hostname, &hostbuf,
tmpbuf.data, tmpbuf.length, &hp, &herr);
- if (ret == 0)
+ if (ret == 0 && hp != NULL)
break;
else
{
/* Enlarge the buffer on ERANGE. */
- if (herr == NETDB_INTERNAL && errno == ERANGE)
+ if (ret != 0 && herr == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (&tmpbuf))
return 0;
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2018-01-01 0:00 [2.28 COMMITTED] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679] Florian Weimer
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