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authorMurray McAllister <murray.mcallister@insomniasec.com>2017-03-27 11:15:12 +0200
committerThomas Hellstrom <thellstrom@vmware.com>2017-03-30 11:43:37 +0200
commit63774069d9527a1aeaa4aa20e929ef5e8e9ecc38 (patch)
tree45b99c756375c0db0953930cb52f7be1b2b814a2 /drivers/gpu
parent36274ab8c596f1240c606bb514da329add2a1bcd (diff)
downloadlinux-63774069d9527a1aeaa4aa20e929ef5e8e9ecc38.tar.bz2
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/gpu')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c2
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;
}