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authorChristian Ambach <christian.ambach@de.ibm.com>2010-04-05 14:12:52 +0200
committerVolker Lendecke <vl@samba.org>2010-04-06 14:09:06 +0200
commit96ae3ee80391e69d2a2c75705a9374b27b2117c8 (patch)
tree72b357dd2692a23238dd2e8162913c9c7a3977b8 /source3
parent449bdf35432230b060387856637759e2fe7022d6 (diff)
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fix a segfault in the notify subsystem
When the notify_array cannot be loaded correctly, do not keep the half-baked parsing results in the global variable. This can lead to segfaults next time notify_load is entered and the seqnum has not changed. This has been seen in a case where mixed smbd versions were running in a CTDB cluster (versions with and w/o commit c216d1e6 that changed the notify_entry structure). There will be missed notifications until all smbds are at the same software level, but this should be acceptable and is better than crashing and interrupting client operations. This fix cleans up the notify_array, removes the unparseable data from the TDB and returns a fresh notify_array that can be worked with. The NDR_PRINT_DEBUG had to be moved to only be called when the parsing succeeded, it was seen to cause additional segfaults. The status variable is intentionally left to NT_STATUS_OK to not make callers abort and report errors to the clients and make them disconnect. Signed-off-by: Christian Ambach <christian.ambach@de.ibm.com>
Diffstat (limited to 'source3')
-rw-r--r--source3/smbd/notify_internal.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/source3/smbd/notify_internal.c b/source3/smbd/notify_internal.c
index bdd4f5059e..22801e9d92 100644
--- a/source3/smbd/notify_internal.c
+++ b/source3/smbd/notify_internal.c
@@ -214,14 +214,25 @@ static NTSTATUS notify_load(struct notify_context *notify, struct db_record *rec
ndr_err = ndr_pull_struct_blob(&blob, notify->array, NULL, notify->array,
(ndr_pull_flags_fn_t)ndr_pull_notify_array);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
- status = ndr_map_error2ntstatus(ndr_err);
+ /* 1. log that we got a corrupt notify_array
+ * 2. clear the variable the garbage was stored into to not trip
+ * over it next time this method is entered with the same seqnum
+ * 3. delete it from the database */
+ DEBUG(2, ("notify_array is corrupt, discarding it\n"));
+
+ ZERO_STRUCTP(notify->array);
+ if (rec != NULL) {
+ rec->delete_rec(rec);
+ }
+
+ } else {
+ if (DEBUGLEVEL >= 10) {
+ DEBUG(10, ("notify_load:\n"));
+ NDR_PRINT_DEBUG(notify_array, notify->array);
+ }
}
}
- if (DEBUGLEVEL >= 10) {
- DEBUG(10, ("notify_load:\n"));
- NDR_PRINT_DEBUG(notify_array, notify->array);
- }
if (!rec) {
talloc_free(dbuf.dptr);