[13/20] fuse: prevent fuse_put_request on invalid pointer

[Greg KH <gregkh@suse.de>]

[-- Attachment #1: fuse-prevent-fuse_put_request-on-invalid-pointer.patch --]
[-- Type: text/plain, Size: 908 bytes --]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Anand V. Avati <avati@gluster.com>

commit f60311d5f7670d9539b424e4ed8b5c0872fc9e83 upstream.

fuse_direct_io() has a loop where requests are allocated in each
iteration. if allocation fails, the loop is broken out and follows
into an unconditional fuse_put_request() on that invalid pointer.

Signed-off-by: Anand V. Avati <avati@gluster.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/fuse/file.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1005,7 +1005,8 @@ static ssize_t fuse_direct_io(struct fil
 				break;
 		}
 	}
-	fuse_put_request(fc, req);
+	if (!IS_ERR(req))
+		fuse_put_request(fc, req);
 	if (res > 0) {
 		if (write)
 			fuse_write_update_size(inode, pos);