xen/gntdev: Check and release imported dma-bufs on close (068e79f4) · Commits · 戴 / test

Check if there are any imported dma-bufs left not released by user-space when grant device's release callback is called and free those if this is the case. This can happen if user-space leaks the buffers because of a bug or application has been terminated for any reason. Signed-off-by:

Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by:

Boris <Ostrovsky@oracle.com> Signed-off-by:

Juergen Gross <jgross@suse.com>

drivers/xen/gntdev-dmabuf.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -745,6 +745,14 @@ static int dmabuf_imp_release(struct gntdev_dmabuf_priv *priv, u32 fd)
		return 0;
		}

		static void dmabuf_imp_release_all(struct gntdev_dmabuf_priv *priv)
		{
		struct gntdev_dmabuf q, gntdev_dmabuf;

		list_for_each_entry_safe(gntdev_dmabuf, q, &priv->imp_list, next)
		dmabuf_imp_release(priv, gntdev_dmabuf->fd);
		}

		/* DMA buffer IOCTL support. */

		long gntdev_ioctl_dmabuf_exp_from_refs(struct gntdev_priv *priv, int use_ptemod,
		@@ -862,5 +870,6 @@ struct gntdev_dmabuf_priv gntdev_dmabuf_init(struct file filp)

		void gntdev_dmabuf_fini(struct gntdev_dmabuf_priv *priv)
		{
		dmabuf_imp_release_all(priv);
		kfree(priv);
		}

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