drm/dumb-buffers: Integer overflow in drm_mode_create_ioctl()

[ Upstream commit 2b6207291b7b277a5df9d1aab44b56815a292dba ]

There is a comment here which says that DIV_ROUND_UP() and that's where
the problem comes from.  Say you pick:

	args->bpp = UINT_MAX - 7;
	args->width = 4;
	args->height = 1;

The integer overflow in DIV_ROUND_UP() means "cpp" is UINT_MAX / 8 and
because of how we picked args->width that means cpp < UINT_MAX / 4.

I've fixed it by preventing the integer overflow in DIV_ROUND_UP().  I
removed the check for !cpp because it's not possible after this change.
I also changed all the 0xffffffffU references to U32_MAX.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180516140026.GA19340@mwanda
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/drm_dumb_buffers.c b/drivers/gpu/drm/drm_dumb_buffers.c
index 39ac15ce47023055f5a2badb7e5a99c59e19b3dd..9e2ae02f31e08fbad87669a126761c015d25db44 100644 (file)
--- a/drivers/gpu/drm/drm_dumb_buffers.c
+++ b/drivers/gpu/drm/drm_dumb_buffers.c
@@ -65,12 +65,13 @@ int drm_mode_create_dumb_ioctl(struct drm_device *dev,
                return -EINVAL;
 
        /* overflow checks for 32bit size calculations */
-       /* NOTE: DIV_ROUND_UP() can overflow */
+       if (args->bpp > U32_MAX - 8)
+               return -EINVAL;
        cpp = DIV_ROUND_UP(args->bpp, 8);
-       if (!cpp || cpp > 0xffffffffU / args->width)
+       if (cpp > U32_MAX / args->width)
                return -EINVAL;
        stride = cpp * args->width;
-       if (args->height > 0xffffffffU / stride)
+       if (args->height > U32_MAX / stride)
                return -EINVAL;
 
        /* test for wrap-around */