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drm: Use array_size() when creating lease

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Passing an object_count of sufficient size will make
object_count * 4 wrap around to be very small, then a later function
will happily iterate off the end of the object_ids array.  Using
array_size() will saturate at SIZE_MAX, the kmalloc() will fail and
we'll return an -ENOMEM to the norty userspace.

Fixes: 62884cd386 ("drm: Add four ioctls for managing drm mode object leases [v7]")
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: <stable@vger.kernel.org> # v4.15+
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Matthew Wilcox 2019-02-14 11:03:48 -08:00 committed by Dave Airlie
parent 7abbb35ba9
commit 69ef943dbc
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/drm_lease.c
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@ -528,7 +528,8 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
object_count = cl->object_count;
object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), object_count * sizeof(__u32));
object_ids = memdup_user(u64_to_user_ptr(cl->object_ids),
array_size(object_count, sizeof(__u32)));
if (IS_ERR(object_ids))
return PTR_ERR(object_ids);