netfilter 01/07: nf_log: fix sleeping function called from invalid context

[Patrick McHardy <kaber@trash.net>]

commit 266d07cb1c9a0c345d7d3aea889f92062894059e
Author: Patrick McHardy <kaber@trash.net>
Date:   Sat Jun 13 12:21:10 2009 +0200

    netfilter: nf_log: fix sleeping function called from invalid context
    
    Fix regression introduced by 17625274 "netfilter: sysctl support of
    logger choice":
    
    BUG: sleeping function called from invalid context at /mnt/s390test/linux-2.6-tip/arch/s390/include/asm/uaccess.h:234
    in_atomic(): 1, irqs_disabled(): 0, pid: 3245, name: sysctl
    CPU: 1 Not tainted 2.6.30-rc8-tipjun10-02053-g39ae214 #1
    Process sysctl (pid: 3245, task: 000000007f675da0, ksp: 000000007eb17cf0)
    0000000000000000 000000007eb17be8 0000000000000002 0000000000000000
           000000007eb17c88 000000007eb17c00 000000007eb17c00 0000000000048156
           00000000003e2de8 000000007f676118 000000007eb17f10 0000000000000000
           0000000000000000 000000007eb17be8 000000000000000d 000000007eb17c58
           00000000003e2050 000000000001635c 000000007eb17be8 000000007eb17c30
    Call Trace:
    (Ý<00000000000162e6>¨ show_trace+0x13a/0x148)
     Ý<00000000000349ea>¨ __might_sleep+0x13a/0x164
     Ý<0000000000050300>¨ proc_dostring+0x134/0x22c
     Ý<0000000000312b70>¨ nf_log_proc_dostring+0xfc/0x188
     Ý<0000000000136f5e>¨ proc_sys_call_handler+0xf6/0x118
     Ý<0000000000136fda>¨ proc_sys_read+0x26/0x34
     Ý<00000000000d6e9c>¨ vfs_read+0xac/0x158
     Ý<00000000000d703e>¨ SyS_read+0x56/0x88
     Ý<0000000000027f42>¨ sysc_noemu+0x10/0x16
    
    Use the nf_log_mutex instead of RCU to fix this.
    
    Reported-and-tested-by: Maran Pakkirisamy <maranpsamy@in.ibm.com>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index beb3731..2fefe14 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -248,14 +248,14 @@ static int nf_log_proc_dostring(ctl_table *table, int write, struct file *filp,
 		rcu_assign_pointer(nf_loggers[tindex], logger);
 		mutex_unlock(&nf_log_mutex);
 	} else {
-		rcu_read_lock();
-		logger = rcu_dereference(nf_loggers[tindex]);
+		mutex_lock(&nf_log_mutex);
+		logger = nf_loggers[tindex];
 		if (!logger)
 			table->data = "NONE";
 		else
 			table->data = logger->name;
 		r = proc_dostring(table, write, filp, buffer, lenp, ppos);
-		rcu_read_unlock();
+		mutex_unlock(&nf_log_mutex);
 	}
 
 	return r;