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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-12-04 16:52:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-04 19:44:13 -0800 |
| commit | 5bf8bec3f4ce044a223c40cbce92590d938f0e9c (patch) | |
| tree | 382e80939a7bbb2af821d51931e290e50427dc6f /drivers | |
| parent | bd7bca4335a55561b627149322e93de1b25404c1 (diff) | |
| download | linux-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.c | 2 |
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); |