Patch "fs: compat: Remove warning from COMPATIBLE_IOCTL" has been added to the 4.4-stable tree

Patch "fs: compat: Remove warning from COMPATIBLE_IOCTL" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    fs: compat: Remove warning from COMPATIBLE_IOCTL

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-compat-remove-warning-from-compatible_ioctl.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9280cdd6fe5b8287a726d24cc1d558b96c8491d7 Mon Sep 17 00:00:00 2001
From: Mark Charlebois <charlebm@gmail.com>
Date: Fri, 28 Apr 2017 15:15:12 -0700
Subject: fs: compat: Remove warning from COMPATIBLE_IOCTL

From: Mark Charlebois <charlebm@gmail.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@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -811,7 +811,7 @@ 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


Patches currently in stable-queue which might be from charlebm@gmail.com are

queue-4.4/fs-compat-remove-warning-from-compatible_ioctl.patch