Patch "drm: crtc: integer overflow in drm_property_create_blob()" has been added to the 4.2-stable tree

Patch "drm: crtc: integer overflow in drm_property_create_blob()" has been added to the 4.2-stable tree

[gregkh]

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

    drm: crtc: integer overflow in drm_property_create_blob()

to the 4.2-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:
     drm-crtc-integer-overflow-in-drm_property_create_blob.patch
and it can be found in the queue-4.2 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 9ac0934bbe52290e4e4c2a58ec41cab9b6ca8c96 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 29 Oct 2015 16:37:54 +0300
Subject: drm: crtc: integer overflow in drm_property_create_blob()

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 9ac0934bbe52290e4e4c2a58ec41cab9b6ca8c96 upstream.

The size here comes from the user via the ioctl, it is a number between
1-u32max so the addition here could overflow on 32 bit systems.

Fixes: f453ba046074 ('DRM: add mode setting support')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_crtc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4221,7 +4221,7 @@ drm_property_create_blob(struct drm_devi
 	struct drm_property_blob *blob;
 	int ret;
 
-	if (!length)
+	if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob))
 		return ERR_PTR(-EINVAL);
 
 	blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);


Patches currently in stable-queue which might be from dan.carpenter@oracle.com are

queue-4.2/drm-crtc-integer-overflow-in-drm_property_create_blob.patch