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

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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>
This commit is contained in:
Patrick McHardy 2010-04-15 13:29:28 +02:00
parent 66496d4973
commit b0ebb739a8
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/ipmr.c
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@ -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 * Check to see if we resolved a queued list. If so we
* need to send on the frames and tidy up. * need to send on the frames and tidy up.
*/ */
found = false;
spin_lock_bh(&mfc_unres_lock); spin_lock_bh(&mfc_unres_lock);
list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
if (uc->mfc_origin == c->mfc_origin && if (uc->mfc_origin == c->mfc_origin &&
uc->mfc_mcastgrp == c->mfc_mcastgrp) { uc->mfc_mcastgrp == c->mfc_mcastgrp) {
list_del(&uc->list); list_del(&uc->list);
atomic_dec(&mrt->cache_resolve_queue_len); atomic_dec(&mrt->cache_resolve_queue_len);
found = true;
break; break;
} }
} }
@ -1102,7 +1104,7 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
del_timer(&mrt->ipmr_expire_timer); del_timer(&mrt->ipmr_expire_timer);
spin_unlock_bh(&mfc_unres_lock); spin_unlock_bh(&mfc_unres_lock);
if (uc) { if (found) {
ipmr_cache_resolve(net, mrt, uc, c); ipmr_cache_resolve(net, mrt, uc, c);
ipmr_cache_free(uc); ipmr_cache_free(uc);
} }