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[NETFILTER]: arp_tables: fix table locking in arpt_do_table

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table->private might change because of ruleset changes, don't use it
without holding the lock.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-08-21 15:31:08 -07:00 committed by David S. Miller
parent 2d8f613160
commit e0b7cde997
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/netfilter/arp_tables.c
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@ -236,7 +236,7 @@ unsigned int arpt_do_table(struct sk_buff **pskb,
struct arpt_entry *e, *back; struct arpt_entry *e, *back;
const char *indev, *outdev; const char *indev, *outdev;
void *table_base; void *table_base;
struct xt_table_info *private = table->private; struct xt_table_info *private;
/* ARP header, plus 2 device addresses, plus 2 IP addresses. */ /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
if (!pskb_may_pull((*pskb), (sizeof(struct arphdr) + if (!pskb_may_pull((*pskb), (sizeof(struct arphdr) +
@ -248,6 +248,7 @@ unsigned int arpt_do_table(struct sk_buff **pskb,
outdev = out ? out->name : nulldevname; outdev = out ? out->name : nulldevname;
read_lock_bh(&table->lock); read_lock_bh(&table->lock);
private = table->private;
table_base = (void *)private->entries[smp_processor_id()]; table_base = (void *)private->entries[smp_processor_id()];
e = get_entry(table_base, private->hook_entry[hook]); e = get_entry(table_base, private->hook_entry[hook]);
back = get_entry(table_base, private->underflow[hook]); back = get_entry(table_base, private->underflow[hook]);