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Blame 0395-Ticket-48944-backport-1.2.11-on-a-read-only-replica-.patch

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From c088ea0049412cfb216ddadb8f2ee7566fc9075c Mon Sep 17 00:00:00 2001
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From: Ludwig Krispenz <lkrispen@redhat.com>
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Date: Wed, 14 Sep 2016 11:39:33 +0200
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Subject: [PATCH] Ticket 48944 - backport 1.2.11 - on a read only replica
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 invalid state info can accumulate
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Bug Description: if internal mods are generated on a consumer (eg by Account Policy)
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		 and changes for these attributes are als received via replication
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		 the state information on the consumer can accumulate
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Fix Description: Make sure replace operations are only applied if they
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		 are newer than an existing attribute deletion csn.
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https://fedorahosted.org/389/ticket/48944
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Reviewed by: Noriko, thanks
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(cherry picked from commit 2e98b9ecd575d4cf531a92df3bbbe3e4f021b0ca)
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(cherry picked from commit 6751a36e8eb1936e3abd0a300fe68341f20bd8a6)
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---
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 ldap/servers/slapd/entrywsi.c | 21 +++++++++++++++++++++
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 1 file changed, 21 insertions(+)
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diff --git a/ldap/servers/slapd/entrywsi.c b/ldap/servers/slapd/entrywsi.c
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index 663d115..76286a1 100644
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--- a/ldap/servers/slapd/entrywsi.c
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+++ b/ldap/servers/slapd/entrywsi.c
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@@ -430,6 +430,8 @@ entry_add_present_values_wsi(Slapi_Entry *e, const char *type, struct berval **b
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 		Slapi_Attr *a= NULL;
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 		long a_flags_orig;
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 		int attr_state= entry_attr_find_wsi(e, type, &a);
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+		const CSN *adcsn = NULL;
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+
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 		if (ATTRIBUTE_NOTFOUND == attr_state)
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 		{
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 			/* Create a new attribute */
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@@ -437,6 +439,17 @@ entry_add_present_values_wsi(Slapi_Entry *e, const char *type, struct berval **b
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 			slapi_attr_init(a, type);
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 			attrlist_add(&e->e_attrs, a);
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 		}
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+
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+		adcsn = attr_get_deletion_csn(a);
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+		if (csn_compare(csn, adcsn) < 0) {
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+			/* the attribute was deleted with an adcsn
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+			 * newer than the current csn.
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+			 * Nothing to do.
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+			 */
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+			valuearray_free(&valuestoadd);
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+			return retVal;
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+		}
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+
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 		a_flags_orig = a->a_flags;
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 		a->a_flags |= flags;
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 		/* Check if the type of the to-be-added values has DN syntax or not. */
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@@ -544,6 +557,14 @@ entry_delete_present_values_wsi(Slapi_Entry *e, const char *type, struct berval
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 		{
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 			/* delete the entire attribute */
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 			LDAPDebug( LDAP_DEBUG_ARGS, "removing entire attribute %s\n", type, 0, 0 );
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+			const CSN *adcsn = attr_get_deletion_csn(a);
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+			if (csn_compare(csn, adcsn) < 0) {
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+				/* the attribute was deleted with an adcsn
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+				 * newer than the current csn.
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+				 * Nothing to do.
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+				 */
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+				return retVal;
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+			}
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 			attr_set_deletion_csn(a,csn);
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 			if(urp)
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 			{
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-- 
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2.4.11
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