linux-kernel - [PATCH] fs: Safe rcu access to hlist.

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Date:   Sun, 19 Nov 2017 15:02:10 -0500
From:   Tim Hansen <devtimhansen@...il.com>
To:     viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        devtimhansen@...il.com
Subject: [PATCH] fs: Safe rcu access to hlist.

Adds hlist_first_rcu and hlist_next_rcu for safe access
to the hlist in seq_hlist_next_rcu.

Found on linux-next branch, tag next-20171117 with sparse.

Signed-off-by: Tim Hansen <devtimhansen@...il.com>
---
 fs/seq_file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/seq_file.c b/fs/seq_file.c
index fb17f35a49a6..0b966781fd60 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -968,9 +968,9 @@ struct hlist_node *seq_hlist_next_rcu(void *v,
 
 	++*ppos;
 	if (v == SEQ_START_TOKEN)
-		return rcu_dereference(head->first);
+		return rcu_dereference(hlist_first_rcu(head));
 	else
-		return rcu_dereference(node->next);
+		return rcu_dereference(hlist_next_rcu(node));
 }
 EXPORT_SYMBOL(seq_hlist_next_rcu);
 
-- 
2.15.0.rc0