[BZ #22342] Fix netgroup cache keys.

Unlike other nscd caches, the netgroup cache contains two types of
records - those for "iterate through a netgroup" (i.e. setnetgrent())
and those for "is this user in this netgroup" (i.e. innetgr()),
i.e. full and partial records.  The timeout code assumes these records
have the same key for the group name, so that the collection of records
that is "this netgroup" can be expired as a unit.

However, the keys are not the same, as the in-netgroup key is generated
by nscd rather than being passed to it from elsewhere, and is generated
without the trailing NUL.  All other keys have the trailing NUL, and as
noted in the linked BZ, debug statements confirm that two keys for the
same netgroup are added to the cache with two different lengths.

The result of this is that as records in the cache expire, the purge
code only cleans out one of the two types of entries, resulting in
stale, possibly incorrect, and possibly inconsistent cache data.

The patch simply includes the existing NUL in the computation for the
key length ('key' points to the char after the NUL, and 'group' to the
first char of the group, so 'key-group' includes the first char to the
NUL, inclusive).

	[BZ #22342]
	* nscd/netgroupcache.c (addinnetgrX): Include trailing NUL in
	key value.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 1c81d55fc4b07b51adf68558ba74ce975153e580)

3 files changed, 8 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index e7f672a8e2..baff9fa479 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-01  DJ Delorie  <dj@delorie.com>
+
+	[BZ #22342]
+	* nscd/netgroupcache.c (addinnetgrX): Include trailing NUL in
+	key value.
+
 2018-02-26  Dmitry V. Levin  <ldv@altlinux.org>
 
 	[BZ #22433]
diff --git a/NEWS b/NEWS
index d6da060f8b..ad425f2c37 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,7 @@ The following bugs are resolved with this release:
 
   [6889] 'PWD' mentioned but not specified
   [16335] Feature test macro documentation incomplete and out of date
+  [22342] NSCD not properly caching netgroup
   [22638] sparc: static binaries are broken if glibc is built by gcc
     configured with --enable-default-pie
   [22735] Misleading typo in time.h source comment regarding CLOCKS_PER_SECOND
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index b832c9315f..2f187b208c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -480,7 +480,7 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
 {
   const char *group = key;
   key = (char *) rawmemchr (key, '\0') + 1;
-  size_t group_len = key - group - 1;
+  size_t group_len = key - group;
   const char *host = *key++ ? key : NULL;
   if (host != NULL)
     key = (char *) rawmemchr (key, '\0') + 1;