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[BZ #9781]

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* grp/compat-initgroups.c (compat_call): Switch to use malloc when
	the input line is too long.
This commit is contained in:
Ulrich Drepper
2009-02-07 04:40:57 +00:00
parent 41f128dc04
commit 1a9dd4e4e4
6 changed files with 38 additions and 12 deletions
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26
grp/compat-initgroups.c
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@ -14,7 +14,6 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
{
struct group grpbuf;
size_t buflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
char *tmpbuf;
enum nss_status status;
set_function setgrent_fct;
get_function getgrent_fct;
@ -35,7 +34,9 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
endgrent_fct = __nss_lookup_function (nip, "endgrent");
tmpbuf = __alloca (buflen);
char *tmpbuf = __alloca (buflen);
bool use_malloc = false;
enum nss_status result = NSS_STATUS_SUCCESS;
do
{
@ -44,8 +45,20 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
status == NSS_STATUS_TRYAGAIN)
&& *errnop == ERANGE)
{
buflen *= 2;
tmpbuf = __alloca (buflen);
if (__libc_use_alloca (buflen * 2))
tmpbuf = extend_alloca (tmpbuf, buflen, buflen * 2);
else
{
buflen *= 2;
char *newbuf = realloc (use_malloc ? tmpbuf : NULL, buflen);
if (newbuf == NULL)
{
result = NSS_STATUS_TRYAGAIN;
goto done;
}
use_malloc = true;
tmpbuf = newbuf;
}
}
if (status != NSS_STATUS_SUCCESS)
@ -102,8 +115,11 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
while (status == NSS_STATUS_SUCCESS);
done:
if (use_malloc)
free (tmpbuf);
if (endgrent_fct)
DL_CALL_FCT (endgrent_fct, ());
return NSS_STATUS_SUCCESS;
return result;
}