[389-commits] [389-ds-base] branch 389-ds-base-1.3.8 updated: Ticket 49967 - entry cache corruption after failed MODRDN

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mreynolds pushed a commit to branch 389-ds-base-1.3.8
in repository 389-ds-base.

The following commit(s) were added to refs/heads/389-ds-base-1.3.8 by this push:
     new 0a2cc3b  Ticket 49967 - entry cache corruption after failed MODRDN
0a2cc3b is described below

commit 0a2cc3bdb266dc9e88900b1851f119157cae2df6
Author: Thierry Bordaz <tbordaz(a)redhat.com&gt;
AuthorDate: Wed Oct 24 15:31:25 2018 +0200

    Ticket 49967 - entry cache corruption after failed MODRDN
    
    Bug Description:
    	During a MODRDN the DN cache is updated to replace
    	source DN with the target DN (modrdn_rename_entry_update_indexes)
    	If later a failure occurs (for example if BETXN_POSTOP fails) and
    	the txn is aborted, the target DN (for the specific entryID) remains
    	in the DN cache.
    
    	If the entry is returned in a search, to build the DN there is
    	a lookup of the DN cache with the entryID. It retrieves the target DN
    	rather than the source DN
    
    Fix Description:
    	In case of failure of the operation, the entry (from the entryID)
    	need to be cleared from the DN cache
    
    https://pagure.io/389-ds-base/issue/49967
    
    Reviewed by: Mark Reynolds
    
    Platforms tested: F27
    
    Flag Day: no
    
    Doc impact: no
    
    (cherry picked from commit ab4af68ef49fcdc5f2f6d0c1f5c7b9a5333b1bee)
---
 ldap/servers/slapd/back-ldbm/ldbm_modrdn.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/ldap/servers/slapd/back-ldbm/ldbm_modrdn.c
b/ldap/servers/slapd/back-ldbm/ldbm_modrdn.c
index b9a092c..684b040 100644
--- a/ldap/servers/slapd/back-ldbm/ldbm_modrdn.c
+++ b/ldap/servers/slapd/back-ldbm/ldbm_modrdn.c
@@ -1400,6 +1400,19 @@ common_return:
                 }
             }
         }
+
+        if (ec && retval) {
+            /* if the operation failed, the destination entry does not exist
+             * but it has been added in dncache during cache_add_tentative
+             * we need to remove it. Else a retrieval from ep_id can give the wrong DN
+             */
+            struct backdn *bdn = dncache_find_id(&inst->inst_dncache,
ec->ep_id);
+            slapi_log_err(SLAPI_LOG_CACHE, "ldbm_back_modrdn",
+                                      "operation failed, the target entry is cleared
from dncache (%s)\n", slapi_entry_get_dn(ec->ep_entry));
+            CACHE_REMOVE(&inst->inst_dncache, bdn);
+            CACHE_RETURN(&inst->inst_dncache, &bdn);
+        }
+
         /* remove the new entry from the cache if the op failed -
            otherwise, leave it in */
         if (ec && inst) {

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