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drm/vmwgfx: Fix kernel NULL pointer dereference on older hardware

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The commit "drm/vmwgfx: Fix up user_dmabuf refcounting", while fixing a
kernel crash introduced a NULL pointer dereference on older hardware.
Fix this.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Thomas Hellstrom 2015-10-12 01:49:39 -07:00
parent 575f9c8604
commit ed7d78b2da
1 changed files with 2 additions and 1 deletions
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drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
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@ -657,7 +657,8 @@ static void vmw_user_surface_base_release(struct ttm_base_object **p_base)
struct vmw_resource *res = &user_srf->srf.res;
*p_base = NULL;
ttm_base_object_unref(&user_srf->backup_base);
if (user_srf->backup_base)
ttm_base_object_unref(&user_srf->backup_base);
vmw_resource_unreference(&res);
}