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authorPatrick McHardy <kaber@trash.net>2010-04-15 13:29:28 +0200
committerPatrick McHardy <kaber@trash.net>2010-04-15 13:31:29 +0200
commitb0ebb739a8f68039f03e80b3476b204fe5adf0d7 (patch)
tree45921e2969657f6a35fbac751218ea78e1f3be9b /net
parent66496d4973dcb848d163805fa6b485850b7555e3 (diff)
downloadlinux-b0ebb739a8f68039f03e80b3476b204fe5adf0d7.tar.bz2
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ipmr.c4
1 files changed, 3 insertions, 1 deletions
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);
}