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| author | Murray McAllister <murray.mcallister@insomniasec.com> | 2017-03-27 11:15:12 +0200 |
|---|---|---|
| committer | Thomas Hellstrom <thellstrom@vmware.com> | 2017-03-30 11:43:37 +0200 |
| commit | 63774069d9527a1aeaa4aa20e929ef5e8e9ecc38 (patch) | |
| tree | 45b99c756375c0db0953930cb52f7be1b2b814a2 /drivers | |
| parent | 36274ab8c596f1240c606bb514da329add2a1bcd (diff) | |
| download | lwn-63774069d9527a1aeaa4aa20e929ef5e8e9ecc38.tar.gz lwn-63774069d9527a1aeaa4aa20e929ef5e8e9ecc38.zip | |
drm/vmwgfx: avoid calling vzalloc with a 0 size in vmw_get_cap_3d_ioctl()
In vmw_get_cap_3d_ioctl(), a user can supply 0 for a size that is
used in vzalloc(). This eventually calls dump_stack() (in warn_alloc()),
which can leak useful addresses to dmesg.
Add check to avoid a size of 0.
Cc: <stable@vger.kernel.org>
Signed-off-by: Murray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c index b8c6a03c8c54..1802d0e7fab8 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c @@ -186,7 +186,7 @@ int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data, bool gb_objects = !!(dev_priv->capabilities & SVGA_CAP_GBOBJECTS); struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv); - if (unlikely(arg->pad64 != 0)) { + if (unlikely(arg->pad64 != 0 || arg->max_size == 0)) { DRM_ERROR("Illegal GET_3D_CAP argument.\n"); return -EINVAL; } |