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authorDaniel Vetter <daniel.vetter@ffwll.ch>2019-12-04 16:52:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-12-04 19:44:13 -0800
commit5bf8bec3f4ce044a223c40cbce92590d938f0e9c (patch)
tree382e80939a7bbb2af821d51931e290e50427dc6f /drivers
parentbd7bca4335a55561b627149322e93de1b25404c1 (diff)
downloadlinux-5bf8bec3f4ce044a223c40cbce92590d938f0e9c.tar.bz2
drm: limit to INT_MAX in create_blob ioctl
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@ffwll.ch Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reported-by: syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com Fixes: 6a30afa8c1fb ("uaccess: disallow > INT_MAX copy sizes") Cc: Kees Cook <keescook@chromium.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/drm_property.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index 892ce636ef72..6ee04803c362 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -561,7 +561,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length,
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);