* [PATCH] nss_files: Use struct scratch_buffer instead of extend_alloca [BZ #18023]
@ 2018-06-25 17:50 Florian Weimer
2018-06-25 21:40 ` DJ Delorie
0 siblings, 1 reply; 2+ messages in thread
From: Florian Weimer @ 2018-06-25 17:50 UTC (permalink / raw)
To: libc-alpha
2018-06-25 Florian Weimer <fweimer@redhat.com>
[BZ #18023]
* nss/nss_files/files-initgroups.c (_nss_files_initgroups_dyn):
Use struct scratch_buffer instead of extend_alloca.
diff --git a/nss/nss_files/files-initgroups.c b/nss/nss_files/files-initgroups.c
index 8af0d4d36a..b441d8345f 100644
--- a/nss/nss_files/files-initgroups.c
+++ b/nss/nss_files/files-initgroups.c
@@ -16,7 +16,6 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <errno.h>
#include <grp.h>
#include <nss.h>
@@ -25,6 +24,7 @@
#include <sys/param.h>
#include <stdbool.h>
#include <stdlib.h>
+#include <scratch_buffer.h>
enum nss_status
_nss_files_initgroups_dyn (const char *user, gid_t group, long int *start,
@@ -46,9 +46,8 @@ _nss_files_initgroups_dyn (const char *user, gid_t group, long int *start,
enum nss_status status = NSS_STATUS_SUCCESS;
bool any = false;
- size_t buflen = 1024;
- void *buffer = alloca (buflen);
- bool buffer_use_malloc = false;
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
gid_t *groups = *groupsp;
@@ -67,26 +66,16 @@ _nss_files_initgroups_dyn (const char *user, gid_t group, long int *start,
}
struct group grp;
- int res = _nss_files_parse_grent (line, &grp, buffer, buflen, errnop);
+ int res = _nss_files_parse_grent (line, &grp,
+ tmpbuf.data, tmpbuf.length, errnop);
if (res == -1)
{
- size_t newbuflen = 2 * buflen;
- if (buffer_use_malloc || ! __libc_use_alloca (buflen + newbuflen))
+ if (!scratch_buffer_grow (&tmpbuf))
{
- void *newbuf = realloc (buffer_use_malloc ? buffer : NULL,
- newbuflen);
- if (newbuf == NULL)
- {
- *errnop = ENOMEM;
- status = NSS_STATUS_TRYAGAIN;
- goto out;
- }
- buffer = newbuf;
- buflen = newbuflen;
- buffer_use_malloc = true;
+ *errnop = ENOMEM;
+ status = NSS_STATUS_TRYAGAIN;
+ goto out;
}
- else
- buffer = extend_alloca (buffer, buflen, newbuflen);
/* Reread current line, the parser has clobbered it. */
fsetpos (stream, &pos);
continue;
@@ -132,8 +121,7 @@ _nss_files_initgroups_dyn (const char *user, gid_t group, long int *start,
out:
/* Free memory. */
- if (buffer_use_malloc)
- free (buffer);
+ scratch_buffer_free (&tmpbuf);
free (line);
fclose (stream);
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] nss_files: Use struct scratch_buffer instead of extend_alloca [BZ #18023]
2018-06-25 17:50 [PATCH] nss_files: Use struct scratch_buffer instead of extend_alloca [BZ #18023] Florian Weimer
@ 2018-06-25 21:40 ` DJ Delorie
0 siblings, 0 replies; 2+ messages in thread
From: DJ Delorie @ 2018-06-25 21:40 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
fweimer@redhat.com (Florian Weimer) writes:
> 2018-06-25 Florian Weimer <fweimer@redhat.com>
>
> [BZ #18023]
> * nss/nss_files/files-initgroups.c (_nss_files_initgroups_dyn):
> Use struct scratch_buffer instead of extend_alloca.
LGTM.
^ permalink raw reply [flat|nested] 2+ messages in thread
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