On 02/26, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@xxxxxxxxxx>
>
> 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: syzbot+e73f2fb5ed5a5df36d33@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: af33a9190d02 ("drm/vgem: Enable dmabuf import interfaces")
> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Laura Abbott <labbott@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
> ---
> drivers/gpu/drm/vgem/vgem_drv.c | 6 +-----
> 1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> index 5930facd6d2d8..11a8f99ba18c5 100644
> --- 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,
> --
> 2.21.0.rc2.261.ga7da99ff1b-goog
>
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Applied to drm-misc-fixes.
Thanks
--
Rodrigo Siqueira
https://siqueira.tech
Graduate Student
Department of Computer Science
University of São Paulo
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