linux-kernel - [PATCH 4.9 020/102] fs: compat: Remove warning from COMPATIBLE

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Date:   Fri,  6 Apr 2018 15:23:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Charlebois <charlebm@...il.com>,
        Behan Webster <behanw@...verseincode.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH 4.9 020/102] fs: compat: Remove warning from COMPATIBLE_IOCTL

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mark Charlebois <charlebm@...il.com>

commit 9280cdd6fe5b8287a726d24cc1d558b96c8491d7 upstream.

cmd in COMPATIBLE_IOCTL is always a u32, so cast it so there isn't a
warning about an overflow in XFORM.

From: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Cc: Nathan Chancellor <natechancellor@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/compat_ioctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -833,7 +833,7 @@ static int compat_ioctl_preallocate(stru
  */
 #define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
 
-#define COMPATIBLE_IOCTL(cmd) XFORM(cmd),
+#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
 /* ioctl should not be warned about even if it's not implemented.
    Valid reasons to use this:
    - It is implemented with ->compat_ioctl on some device, but programs