From: Florian Westphal <fw@strlen.de>
Date: Wed, 3 Apr 2019 06:28:35 +0000 (+0200)
Subject: net: use correct this_cpu primitive in dev_recursion_level
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=28b05b92886871bdd8e6a9df73e3a15845fe8ef4;p=openwrt%2Fstaging%2Fblogic.git

net: use correct this_cpu primitive in dev_recursion_level

syzbot reports:
BUG: using __this_cpu_read() in preemptible code:
caller is dev_recursion_level include/linux/netdevice.h:3052 [inline]
 __this_cpu_preempt_check+0x246/0x270 lib/smp_processor_id.c:47
 dev_recursion_level include/linux/netdevice.h:3052 [inline]
 ip6_skb_dst_mtu include/net/ip6_route.h:245 [inline]

I erronously downgraded a this_cpu_read to __this_cpu_read when
moving dev_recursion_level() around.

Reported-by: syzbot+51471b4aae195285a4a3@syzkaller.appspotmail.com
Fixes: 97cdcf37b57e ("net: place xmit recursion in softnet data")
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index eb9f05e0863d..521eb869555e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3049,7 +3049,7 @@ DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
 
 static inline int dev_recursion_level(void)
 {
-	return __this_cpu_read(softnet_data.xmit.recursion);
+	return this_cpu_read(softnet_data.xmit.recursion);
 }
 
 #define XMIT_RECURSION_LIMIT	10