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authorMark Huang <mlhuang@cs.princeton.edu>2006-08-13 18:57:54 -0700
committerDavid S. Miller <davem@davemloft.net>2006-08-13 18:57:54 -0700
commitdcb7cd97f133f7cfbd181149a1e60215a869f895 (patch)
tree73e600aa19051981a566ad55ca5fa6f9acec4f7a /net/netfilter
parent0eff66e625306a794ecba4b29ed12f7a147ce219 (diff)
[NETFILTER]: ulog: fix panic on SMP kernels
Fix kernel panic on various SMP machines. The culprit is a null ub->skb in ulog_send(). If ulog_timer() has already been scheduled on one CPU and is spinning on the lock, and ipt_ulog_packet() flushes the queue on another CPU by calling ulog_send() right before it exits, there will be no skbuff when ulog_timer() acquires the lock and calls ulog_send(). Cancelling the timer in ulog_send() doesn't help because it has already been scheduled and is running on the first CPU. Similar problem exists in ebt_ulog.c and nfnetlink_log.c. Signed-off-by: Mark Huang <mlhuang@cs.princeton.edu> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nfnetlink_log.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 61cdda4e5d3..b59d3b2bde2 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -366,6 +366,9 @@ __nfulnl_send(struct nfulnl_instance *inst)
if (timer_pending(&inst->timer))
del_timer(&inst->timer);
+ if (!inst->skb)
+ return 0;
+
if (inst->qlen > 1)
inst->lastnlh->nlmsg_type = NLMSG_DONE;