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From c3e0098383fb199d678df54bfd129123a8184e70 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Wed, 18 Apr 2018 10:23:22 +0200
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Subject: [PATCH] nss-idmap: use right group list pointer after sss_get_ex()
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If the initial array is too small it will be reallocated during
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sss_get_ex() and the pointer might change and the initial memory area
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should not be used anymore.
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Related to https://pagure.io/SSSD/sssd/issue/3715
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Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
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(cherry picked from commit 2c4dc7a4d98c439c69625f12ba4c3c8253f4cc5b)
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---
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src/sss_client/idmap/sss_nss_ex.c | 18 +++++++++---------
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1 file changed, 9 insertions(+), 9 deletions(-)
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diff --git a/src/sss_client/idmap/sss_nss_ex.c b/src/sss_client/idmap/sss_nss_ex.c
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index f56bffcc24a7e2503e23a892541a9242ed4b5069..5bcfe8850b5355d6cbe0efc5e52fe076737f2a08 100644
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--- a/src/sss_client/idmap/sss_nss_ex.c
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+++ b/src/sss_client/idmap/sss_nss_ex.c
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@@ -485,7 +485,6 @@ int sss_nss_getgrouplist_timeout(const char *name, gid_t group,
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uint32_t flags, unsigned int timeout)
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{
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int ret;
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- gid_t *new_groups;
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long int new_ngroups;
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long int start = 1;
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struct nss_input inp = {
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@@ -498,27 +497,28 @@ int sss_nss_getgrouplist_timeout(const char *name, gid_t group,
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}
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new_ngroups = MAX(1, *ngroups);
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- new_groups = malloc(new_ngroups * sizeof(gid_t));
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- if (new_groups == NULL) {
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+ inp.result.initgrrep.groups = malloc(new_ngroups * sizeof(gid_t));
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+ if (inp.result.initgrrep.groups == NULL) {
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free(discard_const(inp.rd.data));
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return ENOMEM;
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}
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- new_groups[0] = group;
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+ inp.result.initgrrep.groups[0] = group;
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- inp.result.initgrrep.groups = new_groups,
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inp.result.initgrrep.ngroups = &new_ngroups;
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inp.result.initgrrep.start = &start;
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-
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+ /* inp.result.initgrrep.groups, inp.result.initgrrep.ngroups and
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+ * inp.result.initgrrep.start might be modified by sss_get_ex() */
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ret = sss_get_ex(&inp, flags, timeout);
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free(discard_const(inp.rd.data));
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if (ret != 0) {
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- free(new_groups);
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+ free(inp.result.initgrrep.groups);
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return ret;
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}
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- memcpy(groups, new_groups, MIN(*ngroups, start) * sizeof(gid_t));
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- free(new_groups);
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+ memcpy(groups, inp.result.initgrrep.groups,
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+ MIN(*ngroups, start) * sizeof(gid_t));
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+ free(inp.result.initgrrep.groups);
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if (start > *ngroups) {
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ret = ERANGE;
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--
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2.14.3
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