drm/vgem: fix use-after-free when drm_gem_handle_create() fails

If drm_gem_handle_create() fails in vgem_gem_create(), then the
drm_vgem_gem_object is freed twice: once when the reference is dropped
by drm_gem_object_put_unlocked(), and again by __vgem_gem_destroy().

This was hit by syzkaller using fault injection.

Fix it by skipping the second free.

Reported-by: [email protected]
Fixes: af33a9190d02 ("drm/vgem: Enable dmabuf import interfaces")
Reviewed-by: Chris Wilson <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Signed-off-by: Eric Biggers <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index 5930facd6d2d85cca81cb9c1f5247a6be3632546..11a8f99ba18c5f007734abef1003cc44d5e778a1 100644 (file)
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -191,13 +191,9 @@ static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
        ret = drm_gem_handle_create(file, &obj->base, handle);
        drm_gem_object_put_unlocked(&obj->base);
        if (ret)
-               goto err;
+               return ERR_PTR(ret);
 
        return &obj->base;
-
-err:
-       __vgem_gem_destroy(obj);
-       return ERR_PTR(ret);
 }
 
 static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,