linux-kernel - [PATCH] staging/lustre: use rcu_dereference to access rcu protected current->real

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Message-ID: <87k36ltoob.fsf@gmail.com>
Date:	Wed, 6 Aug 2014 21:22:43 +0300
From:	Evgeny Budilovsky <budevg@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Oleg Drokin <green@...uxhacker.ru>,
	Peng Tao <bergwolf@...il.com>, Lai Siyao <lai.siyao@...el.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging/lustre: use rcu_dereference to access rcu protected current->real_parent field



Signed-off-by: Evgeny Budilovsky <budevg@...il.com>
---
 drivers/staging/lustre/lustre/llite/lproc_llite.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/llite/lproc_llite.c b/drivers/staging/lustre/lustre/llite/lproc_llite.c
index 77f68b5..7e61468 100644
--- a/drivers/staging/lustre/lustre/llite/lproc_llite.c
+++ b/drivers/staging/lustre/lustre/llite/lproc_llite.c
@@ -910,7 +910,8 @@ void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
 		 sbi->ll_stats_track_id == current->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
-		 sbi->ll_stats_track_id == current->real_parent->pid)
+		 sbi->ll_stats_track_id ==
+			rcu_dereference(current->real_parent)->pid)
 		lprocfs_counter_add(sbi->ll_stats, op, count);
 	else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
 		 sbi->ll_stats_track_id ==
-- 
1.8.1.2

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