sssd/0036-nss-idmap-use-right-group-list-pointer-after-sss_get.patch

70 lines
2.4 KiB
Diff
Raw Normal View History

From b24ef81656fc3d0dce49b1756ba53c46b5881a14 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Wed, 18 Apr 2018 10:23:22 +0200
Subject: [PATCH] nss-idmap: use right group list pointer after sss_get_ex()
If the initial array is too small it will be reallocated during
sss_get_ex() and the pointer might change and the initial memory area
should not be used anymore.
Related to https://pagure.io/SSSD/sssd/issue/3715
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit 2c4dc7a4d98c439c69625f12ba4c3c8253f4cc5b)
---
src/sss_client/idmap/sss_nss_ex.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/src/sss_client/idmap/sss_nss_ex.c b/src/sss_client/idmap/sss_nss_ex.c
index b87b5e3b2..971422063 100644
--- a/src/sss_client/idmap/sss_nss_ex.c
+++ b/src/sss_client/idmap/sss_nss_ex.c
@@ -485,7 +485,6 @@ int sss_nss_getgrouplist_timeout(const char *name, gid_t group,
uint32_t flags, unsigned int timeout)
{
int ret;
- gid_t *new_groups;
long int new_ngroups;
long int start = 1;
struct nss_input inp = {
@@ -498,27 +497,28 @@ int sss_nss_getgrouplist_timeout(const char *name, gid_t group,
}
new_ngroups = MAX(1, *ngroups);
- new_groups = malloc(new_ngroups * sizeof(gid_t));
- if (new_groups == NULL) {
+ inp.result.initgrrep.groups = malloc(new_ngroups * sizeof(gid_t));
+ if (inp.result.initgrrep.groups == NULL) {
free(discard_const(inp.rd.data));
return ENOMEM;
}
- new_groups[0] = group;
+ inp.result.initgrrep.groups[0] = group;
- inp.result.initgrrep.groups = new_groups,
inp.result.initgrrep.ngroups = &new_ngroups;
inp.result.initgrrep.start = &start;
-
+ /* inp.result.initgrrep.groups, inp.result.initgrrep.ngroups and
+ * inp.result.initgrrep.start might be modified by sss_get_ex() */
ret = sss_get_ex(&inp, flags, timeout);
free(discard_const(inp.rd.data));
if (ret != 0) {
- free(new_groups);
+ free(inp.result.initgrrep.groups);
return ret;
}
- memcpy(groups, new_groups, MIN(*ngroups, start) * sizeof(gid_t));
- free(new_groups);
+ memcpy(groups, inp.result.initgrrep.groups,
+ MIN(*ngroups, start) * sizeof(gid_t));
+ free(inp.result.initgrrep.groups);
if (start > *ngroups) {
ret = ERANGE;
--
2.14.3