[PATCH] BUG 9139: Fix the username map optimization.

[Andreas Schneider]

If we successfully map a user. We call

set_last_from_to(user_in, unixname);

in the while loop reading the map file. After a successfull map we don't
stop and continue the loop to check all other mappings in the username
mapfile. But when we hit the end of the file and leave the loop we call:

set_last_from_to(user_in, user_in);

This overwrites the successful mapping, and the next time we call
map_username() we skip the username and no mapping is done.

Signed-off-by: Andreas Schneider <asn at samba.org>
---
 source3/auth/user_util.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/source3/auth/user_util.c b/source3/auth/user_util.c
index 4842192..082c885 100644
--- a/source3/auth/user_util.c
+++ b/source3/auth/user_util.c
@@ -427,12 +427,16 @@ bool map_username(TALLOC_CTX *ctx, const char *user_in, char **p_user_out)
 	x_fclose(f);
 
 	/*
-	 * Setup the last_from and last_to as an optimization so
+	 * If we didn't successfully map a user in the loop above,
+	 * setup the last_from and last_to as an optimization so
 	 * that we don't scan the file again for the same user.
 	 */
-
-	set_last_from_to(user_in, user_in);
-	store_map_in_gencache(ctx, user_in, user_in);
+	if (!mapped_user) {
+		DEBUG(8, ("The user '%s' has no mapping. "
+			  "Skip it next time.\n", user_in));
+		set_last_from_to(user_in, user_in);
+		store_map_in_gencache(ctx, user_in, user_in);
+	}
 
 	return mapped_user;
 }
-- 
1.8.2