netfilter: nf_log: fix sleeping function called from invalid context in seq_show()

[  171.925285] BUG: sleeping function called from invalid context at kernel/mutex.c:280
[  171.925296] in_atomic(): 1, irqs_disabled(): 0, pid: 671, name: grep
[  171.925306] 2 locks held by grep/671:
[  171.925312]  #0:  (&p->lock){+.+.+.}, at: [<c10b8acd>] seq_read+0x25/0x36c
[  171.925340]  #1:  (rcu_read_lock){.+.+..}, at: [<c1391dac>] seq_start+0x0/0x44
[  171.925372] Pid: 671, comm: grep Not tainted 2.6.31.6-4-netbook #3
[  171.925380] Call Trace:
[  171.925398]  [<c105104e>] ? __debug_show_held_locks+0x1e/0x20
[  171.925414]  [<c10264ac>] __might_sleep+0xfb/0x102
[  171.925430]  [<c1461521>] mutex_lock_nested+0x1c/0x2ad
[  171.925444]  [<c1391c9e>] seq_show+0x74/0x127
[  171.925456]  [<c10b8c5c>] seq_read+0x1b4/0x36c
[  171.925469]  [<c10b8aa8>] ? seq_read+0x0/0x36c
[  171.925483]  [<c10d5c8e>] proc_reg_read+0x60/0x74
[  171.925496]  [<c10d5c2e>] ? proc_reg_read+0x0/0x74
[  171.925510]  [<c10a4468>] vfs_read+0x87/0x110
[  171.925523]  [<c10a458a>] sys_read+0x3b/0x60
[  171.925538]  [<c1002a49>] syscall_call+0x7/0xb

Fix it by replacing RCU with nf_log_mutex.

Reported-by: "Yin, Kangkai" <kangkai.yin@intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index c93494f..d65d348 100644 (file)
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -128,9 +128,8 @@ EXPORT_SYMBOL(nf_log_packet);
 
 #ifdef CONFIG_PROC_FS
 static void *seq_start(struct seq_file *seq, loff_t *pos)
-       __acquires(RCU)
 {
-       rcu_read_lock();
+       mutex_lock(&nf_log_mutex);
 
        if (*pos >= ARRAY_SIZE(nf_loggers))
                return NULL;
@@ -149,9 +148,8 @@ static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
 }
 
 static void seq_stop(struct seq_file *s, void *v)
-       __releases(RCU)
 {
-       rcu_read_unlock();
+       mutex_unlock(&nf_log_mutex);
 }
 
 static int seq_show(struct seq_file *s, void *v)
@@ -161,7 +159,7 @@ static int seq_show(struct seq_file *s, void *v)
        struct nf_logger *t;
        int ret;
 
-       logger = rcu_dereference(nf_loggers[*pos]);
+       logger = nf_loggers[*pos];
 
        if (!logger)
                ret = seq_printf(s, "%2lld NONE (", *pos);
@@ -171,22 +169,16 @@ static int seq_show(struct seq_file *s, void *v)
        if (ret < 0)
                return ret;
 
-       mutex_lock(&nf_log_mutex);
        list_for_each_entry(t, &nf_loggers_l[*pos], list[*pos]) {
                ret = seq_printf(s, "%s", t->name);
-               if (ret < 0) {
-                       mutex_unlock(&nf_log_mutex);
+               if (ret < 0)
                        return ret;
-               }
                if (&t->list[*pos] != nf_loggers_l[*pos].prev) {
                        ret = seq_printf(s, ",");
-                       if (ret < 0) {
-                               mutex_unlock(&nf_log_mutex);
+                       if (ret < 0)
                                return ret;
-                       }
                }
        }
-       mutex_unlock(&nf_log_mutex);
 
        return seq_printf(s, ")\n");
 }