[NETFILTER]: recent match: fix "sleeping function called from invalid context" 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 --- commit 6812aa38ac35d6e819058d2273a6a7de091a2604 tree 140fea396f29415d7981fcfbc5980f5c0b2d91a7 parent a0447a3000b5d4e926928493def9d62aae3b87ed author Patrick McHardy Thu, 01 Jun 2006 16:40:39 +0200 committer Patrick McHardy Thu, 01 Jun 2006 16:40:39 +0200 net/ipv4/netfilter/ipt_recent.c | 15 ++++++++++----- 1 files changed, 10 insertions(+), 5 deletions(-) diff --git a/net/ipv4/netfilter/ipt_recent.c b/net/ipv4/netfilter/ipt_recent.c index 9686c4d..9b09e48 100644 --- a/net/ipv4/netfilter/ipt_recent.c +++ b/net/ipv4/netfilter/ipt_recent.c @@ -69,6 +69,7 @@ #endif 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 @@ #ifdef CONFIG_PROC_FS 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