[PATCH] net: fix possible deadlock in sum_frag_mem_limit

From: Eric Dumazet
Date: Fri Feb 22 2013 - 12:43:44 EST

From: Eric Dumazet <edumazet@xxxxxxxxxx>

Dave Jones reported a lockdep splat occurring in IP defrag code.

commit 6d7b857d541ecd1d (net: use lib/percpu_counter API for
fragmentation mem accounting) added a possible deadlock.

Because percpu_counter_sum_positive() needs to acquire
a lock that can be used from softirq, we need to disable BH
in sum_frag_mem_limit()

Reported-by: Dave Jones <davej@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
include/net/inet_frag.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 3f237db..76c3fe5 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -114,7 +114,13 @@ static inline void init_frag_mem_limit(struct netns_frags *nf)

static inline int sum_frag_mem_limit(struct netns_frags *nf)
- return percpu_counter_sum_positive(&nf->mem);
+ int res;
+ local_bh_disable();
+ res = percpu_counter_sum_positive(&nf->mem);
+ local_bh_enable();
+ return res;

static inline void inet_frag_lru_move(struct inet_frag_queue *q)

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