From: Patrick McHardy <[EMAIL PROTECTED]>
create_proc_entry must not be called with locks held. Use a mutex instead
to protect data only changed in user context.
Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
net/ipv4/netfilter/ipt_recent.c | 15 ++-
1 file changed, 10 insertions(+), 5 deletions(-)
diff -puN
net/ipv4/netfilter/ipt_recent.c~recent-match-fix-sleeping-function-called-from-invalid-context
net/ipv4/netfilter/ipt_recent.c
---
devel/net/ipv4/netfilter/ipt_recent.c~recent-match-fix-sleeping-function-called-from-invalid-context
2006-06-01 20:31:51.0 -0700
+++ devel-akpm/net/ipv4/netfilter/ipt_recent.c 2006-06-01 20:31:51.0
-0700
@@ -69,6 +69,7 @@ struct recent_table {
static LIST_HEAD(tables);
static DEFINE_SPINLOCK(recent_lock);
+static DEFINE_MUTEX(recent_mutex);
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_dir;
@@ -249,7 +250,7 @@ ipt_recent_checkentry(const char *tablen
strnlen(info->name, IPT_RECENT_NAME_LEN) == IPT_RECENT_NAME_LEN)
return 0;
- spin_lock_bh(&recent_lock);
+ mutex_lock(&recent_mutex);
t = recent_table_lookup(info->name);
if (t != NULL) {
t->refcnt++;
@@ -258,7 +259,7 @@ ipt_recent_checkentry(const char *tablen
}
t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
- GFP_ATOMIC);
+ GFP_KERNEL);
if (t == NULL)
goto out;
strcpy(t->name, info->name);
@@ -274,10 +275,12 @@ ipt_recent_checkentry(const char *tablen
t->proc->proc_fops = &recent_fops;
t->proc->data = t;
#endif
+ spin_lock_bh(&recent_lock);
list_add_tail(&t->list, &tables);
+ spin_unlock_bh(&recent_lock);
ret = 1;
out:
- spin_unlock_bh(&recent_lock);
+ mutex_unlock(&recent_mutex);
return ret;
}
@@ -288,17 +291,19 @@ ipt_recent_destroy(const struct xt_match
const struct ipt_recent_info *info = matchinfo;
struct recent_table *t;
- spin_lock_bh(&recent_lock);
+ mutex_lock(&recent_mutex);
t = recent_table_lookup(info->name);
if (--t->refcnt == 0) {
+ spin_lock_bh(&recent_lock);
list_del(&t->list);
+ spin_unlock_bh(&recent_lock);
recent_table_flush(t);
#ifdef CONFIG_PROC_FS
remove_proc_entry(t->name, proc_dir);
#endif
kfree(t);
}
- spin_unlock_bh(&recent_lock);
+ mutex_unlock(&recent_mutex);
}
#ifdef CONFIG_PROC_FS
_
-
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