linux-kernel - [PATCH] fuse: avoid clobbering fc->release with fuse_conn

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Date:	Sun, 31 May 2015 18:31:04 -0700
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	fuse-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Jeremiah Mahler <jmmahler@...il.com>
Subject: [PATCH] fuse: avoid clobbering fc->release with fuse_conn_init(fc)

fuse_conn_init(fc) zeros the entire fc structure before it assigns
specific values.  Since fc->release is set before fuse_conn_init(fc)
is called, the value gets set to zero, which results in a NULL pointer
deference when fc->release() is called.  Fix the problem by assigning
fc->release after calling fuse_conn_init(fc) instead of before.

Signed-off-by: Jeremiah Mahler <jmmahler@...il.com>
Fixes: daccc092d1a2 ("fuse: initialize fc->release before calling it")
---
 fs/fuse/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 01ff55d..2913db2 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1076,8 +1076,8 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 	if (!fc)
 		goto err_fput;
 
-	fc->release = fuse_free_conn;
 	fuse_conn_init(fc);
+	fc->release = fuse_free_conn;
 
 	fud = fuse_dev_alloc(fc);
 	if (!fud)
-- 
2.1.4

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