* [PATCH] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
@ 2018-09-19 20:52 Florian Weimer
2018-09-20 2:09 ` Yu, Mingli
0 siblings, 1 reply; 3+ messages in thread
From: Florian Weimer @ 2018-09-19 20:52 UTC (permalink / raw)
To: Mingli Yu; +Cc: libc-alpha
Compared to the version posted on Bugzilla, I added a check on ret. If
ret == 0 and hp == NULL, herr and errno are not necessarily valid.
Okay for master?
Thanks,
Florian
Commit message:
Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
A NULL value can happen with certain gethostbyname_r failures.
ChangeLog entry:
2018-09-19 Mingli Yu <Mingli.Yu@windriver.com>
* sysdeps/unix/sysv/linux/gethostid.c (gethostid): Check for NULL
value from gethostbyname_r.
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;
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
2018-09-19 20:52 [PATCH] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679] Florian Weimer
@ 2018-09-20 2:09 ` Yu, Mingli
2018-09-20 10:02 ` Florian Weimer
0 siblings, 1 reply; 3+ messages in thread
From: Yu, Mingli @ 2018-09-20 2:09 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
On 2018年09月20日 04:51, Florian Weimer wrote:
> Compared to the version posted on Bugzilla, I added a check on ret. If
> ret == 0 and hp == NULL, herr and errno are not necessarily valid.
>
> Okay for master?
Thanks Florian for your respond! I'm fine with your update for the patch.
Thanks,
Mingli
>
> Thanks,
> Florian
>
> Commit message:
>
> Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
>
> A NULL value can happen with certain gethostbyname_r failures.
>
> ChangeLog entry:
>
> 2018-09-19 Mingli Yu <Mingli.Yu@windriver.com>
>
> * sysdeps/unix/sysv/linux/gethostid.c (gethostid): Check for NULL
> value from gethostbyname_r.
>
> 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;
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679]
2018-09-20 2:09 ` Yu, Mingli
@ 2018-09-20 10:02 ` Florian Weimer
0 siblings, 0 replies; 3+ messages in thread
From: Florian Weimer @ 2018-09-20 10:02 UTC (permalink / raw)
To: Yu, Mingli; +Cc: libc-alpha
* Mingli Yu:
> On 2018年09月20日 04:51, Florian Weimer wrote:
>> Compared to the version posted on Bugzilla, I added a check on ret. If
>> ret == 0 and hp == NULL, herr and errno are not necessarily valid.
>>
>> Okay for master?
>
> Thanks Florian for your respond! I'm fine with your update for the
> patch.
Thanks, I will check it in.
Florian
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-09-19 20:52 [PATCH] Linux gethostid: Check for NULL value from gethostbyname_r [BZ #23679] Florian Weimer
2018-09-20 2:09 ` Yu, Mingli
2018-09-20 10:02 ` Florian Weimer
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