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| author | Matthew Wilcox <willy@infradead.org> | 2019-02-14 11:03:48 -0800 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2019-02-15 13:08:08 +1000 |
| commit | 69ef943dbc14b21987c79f8399ffea08f9a1b446 (patch) | |
| tree | 2e231c985a2670be1966b1f81c92004641ba3736 /drivers/gpu | |
| parent | 7abbb35ba98ec52583b92898b2e37533f462d248 (diff) | |
| download | linux-69ef943dbc14b21987c79f8399ffea08f9a1b446.tar.gz linux-69ef943dbc14b21987c79f8399ffea08f9a1b446.tar.bz2 linux-69ef943dbc14b21987c79f8399ffea08f9a1b446.zip | |
drm: Use array_size() when creating lease
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: 62884cd386b8 ("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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_lease.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c index 99cba8ea5d82..5df1256618cc 100644 --- a/drivers/gpu/drm/drm_lease.c +++ b/drivers/gpu/drm/drm_lease.c @@ -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); |