This is a note to let you know that I've just added the patch titled drm: limit to INT_MAX in create_blob ioctl to the 5.4-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: drm-limit-to-int_max-in-create_blob-ioctl.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 5bf8bec3f4ce044a223c40cbce92590d938f0e9c Mon Sep 17 00:00:00 2001 From: Daniel Vetter <daniel.vetter@xxxxxxxx> Date: Wed, 4 Dec 2019 16:52:37 -0800 Subject: drm: limit to INT_MAX in create_blob ioctl From: Daniel Vetter <daniel.vetter@xxxxxxxx> commit 5bf8bec3f4ce044a223c40cbce92590d938f0e9c upstream. The hardened usercpy code is too paranoid ever since commit 6a30afa8c1fb ("uaccess: disallow > INT_MAX copy sizes") Code itself should have been fine as-is. Link: http://lkml.kernel.org/r/20191106164755.31478-1-daniel.vetter@xxxxxxxx Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> Reported-by: syzbot+fb77e97ebf0612ee6914@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 6a30afa8c1fb ("uaccess: disallow > INT_MAX copy sizes") Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/drm_property.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/drm_property.c +++ b/drivers/gpu/drm/drm_property.c @@ -561,7 +561,7 @@ drm_property_create_blob(struct drm_devi struct drm_property_blob *blob; int ret; - if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob)) + if (!length || length > INT_MAX - sizeof(struct drm_property_blob)) return ERR_PTR(-EINVAL); blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are queue-5.4/drm-limit-to-int_max-in-create_blob-ioctl.patch