From: Patrick McHardy <kaber@trash.net>
Date: Thu, 15 Apr 2010 11:29:28 +0000 (+0200)
Subject: ipv4: ipmr: fix invalid cache resolving when adding a non-matching entry
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b0ebb739a8f68039f03e80b3476b204fe5adf0d7;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

ipv4: ipmr: fix invalid cache resolving when adding a non-matching entry

The patch to convert struct mfc_cache to list_heads (ipv4: ipmr: convert
struct mfc_cache to struct list_head) introduced a bug when adding new
cache entries that don't match any unresolved entries.

The unres queue is searched for a matching entry, which is then resolved.
When no matching entry is present, the iterator points to the head of the
list, but is treated as a matching entry. Use a seperate variable to
indicate that a matching entry was found.

Signed-off-by: Patrick McHardy <kaber@trash.net>
---

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5df5fd74c6d1..0643fb6d47c4 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1089,12 +1089,14 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
 	 *	Check to see if we resolved a queued list. If so we
 	 *	need to send on the frames and tidy up.
 	 */
+	found = false;
 	spin_lock_bh(&mfc_unres_lock);
 	list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
 		if (uc->mfc_origin == c->mfc_origin &&
 		    uc->mfc_mcastgrp == c->mfc_mcastgrp) {
 			list_del(&uc->list);
 			atomic_dec(&mrt->cache_resolve_queue_len);
+			found = true;
 			break;
 		}
 	}
@@ -1102,7 +1104,7 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
 		del_timer(&mrt->ipmr_expire_timer);
 	spin_unlock_bh(&mfc_unres_lock);
 
-	if (uc) {
+	if (found) {
 		ipmr_cache_resolve(net, mrt, uc, c);
 		ipmr_cache_free(uc);
 	}