* [PATCH v2] resolv/nss_dns/dns-host: Get rid of alloca.
@ 2023-08-10 15:57 Joe Simmons-Talbott
2023-08-11 17:38 ` Siddhesh Poyarekar
0 siblings, 1 reply; 3+ messages in thread
From: Joe Simmons-Talbott @ 2023-08-10 15:57 UTC (permalink / raw)
To: libc-alpha; +Cc: Joe Simmons-Talbott
Since the alloca is a small constant size use an array instead.
---
Changes to v1:
* Use sizeof (tmp) rather than NS_MAXDNAME
resolv/nss_dns/dns-host.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index 1d60c51f5e..c8b77bbc35 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -378,6 +378,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
int *herrnop, int32_t *ttlp)
{
enum nss_status status = check_name (name, herrnop);
+ char tmp[NS_MAXDNAME];
if (status != NSS_STATUS_SUCCESS)
return status;
struct resolv_context *ctx = __resolv_context_get ();
@@ -395,8 +396,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
*/
if (strchr (name, '.') == NULL)
{
- char *tmp = alloca (NS_MAXDNAME);
- const char *cp = __res_context_hostalias (ctx, name, tmp, NS_MAXDNAME);
+ const char *cp = __res_context_hostalias (ctx, name, tmp, sizeof (tmp));
if (cp != NULL)
name = cp;
}
--
2.39.2
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] resolv/nss_dns/dns-host: Get rid of alloca.
2023-08-10 15:57 [PATCH v2] resolv/nss_dns/dns-host: Get rid of alloca Joe Simmons-Talbott
@ 2023-08-11 17:38 ` Siddhesh Poyarekar
2023-08-14 14:14 ` Joe Simmons-Talbott
0 siblings, 1 reply; 3+ messages in thread
From: Siddhesh Poyarekar @ 2023-08-11 17:38 UTC (permalink / raw)
To: Joe Simmons-Talbott, libc-alpha
On 2023-08-10 11:57, Joe Simmons-Talbott via Libc-alpha wrote:
> Since the alloca is a small constant size use an array instead.
> ---
> Changes to v1:
> * Use sizeof (tmp) rather than NS_MAXDNAME
> resolv/nss_dns/dns-host.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
> index 1d60c51f5e..c8b77bbc35 100644
> --- a/resolv/nss_dns/dns-host.c
> +++ b/resolv/nss_dns/dns-host.c
> @@ -378,6 +378,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
> int *herrnop, int32_t *ttlp)
> {
> enum nss_status status = check_name (name, herrnop);
> + char tmp[NS_MAXDNAME];
> if (status != NSS_STATUS_SUCCESS)
> return status;
> struct resolv_context *ctx = __resolv_context_get ();
> @@ -395,8 +396,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
> */
> if (strchr (name, '.') == NULL)
> {
> - char *tmp = alloca (NS_MAXDNAME);
You could keep tmp here, it doesn't have to go into the higher scope.
> - const char *cp = __res_context_hostalias (ctx, name, tmp, NS_MAXDNAME);
> + const char *cp = __res_context_hostalias (ctx, name, tmp, sizeof (tmp));
> if (cp != NULL)
> name = cp;
> }
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] resolv/nss_dns/dns-host: Get rid of alloca.
2023-08-11 17:38 ` Siddhesh Poyarekar
@ 2023-08-14 14:14 ` Joe Simmons-Talbott
0 siblings, 0 replies; 3+ messages in thread
From: Joe Simmons-Talbott @ 2023-08-14 14:14 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: libc-alpha
On Fri, Aug 11, 2023 at 01:38:43PM -0400, Siddhesh Poyarekar wrote:
>
>
> On 2023-08-10 11:57, Joe Simmons-Talbott via Libc-alpha wrote:
> > Since the alloca is a small constant size use an array instead.
> > ---
> > Changes to v1:
> > * Use sizeof (tmp) rather than NS_MAXDNAME
> > resolv/nss_dns/dns-host.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
> > index 1d60c51f5e..c8b77bbc35 100644
> > --- a/resolv/nss_dns/dns-host.c
> > +++ b/resolv/nss_dns/dns-host.c
> > @@ -378,6 +378,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
> > int *herrnop, int32_t *ttlp)
> > {
> > enum nss_status status = check_name (name, herrnop);
> > + char tmp[NS_MAXDNAME];
> > if (status != NSS_STATUS_SUCCESS)
> > return status;
> > struct resolv_context *ctx = __resolv_context_get ();
> > @@ -395,8 +396,7 @@ _nss_dns_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
> > */
> > if (strchr (name, '.') == NULL)
> > {
> > - char *tmp = alloca (NS_MAXDNAME);
>
> You could keep tmp here, it doesn't have to go into the higher scope.
I moved it back in v3[1].
[1] https://sourceware.org/pipermail/libc-alpha/2023-August/150901.html
Thanks,
Joe
>
> > - const char *cp = __res_context_hostalias (ctx, name, tmp, NS_MAXDNAME);
> > + const char *cp = __res_context_hostalias (ctx, name, tmp, sizeof (tmp));
> > if (cp != NULL)
> > name = cp;
> > }
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-08-10 15:57 [PATCH v2] resolv/nss_dns/dns-host: Get rid of alloca Joe Simmons-Talbott
2023-08-11 17:38 ` Siddhesh Poyarekar
2023-08-14 14:14 ` Joe Simmons-Talbott
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