NSS: Set packet length for initgroups

Some groups could be skipped, but packet length was not trimmed.
This is a reason why valgrind reported access to uninitialised bytes.
Actually, it isn't a problem, because the first uint32 in body is number of
sended gids.

Resolves:
https://fedorahosted.org/sssd/ticket/2138

1 files changed, 7 insertions, 0 deletions

diff --git a/src/responder/nss/nsssrv_cmd.c b/src/responder/nss/nsssrv_cmd.c
index 564d66f0d..550017c0e 100644
--- a/src/responder/nss/nsssrv_cmd.c
+++ b/src/responder/nss/nsssrv_cmd.c
@@ -3558,6 +3558,13 @@ static int fill_initgr(struct sss_packet *packet, struct ldb_result *res)
 
     ((uint32_t *)body)[0] = num-skipped; /* num results */
     ((uint32_t *)body)[1] = 0; /* reserved */
+    blen = (2 + bindex) * sizeof(uint32_t);
+    ret = sss_packet_set_size(packet, blen);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE,
+              ("Could not set packet size to value:%zu\n", blen));
+        return ret;
+    }
 
     return EOK;
 }