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xen/gntdev: Check and release imported dma-bufs on close

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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>
This commit is contained in:
Oleksandr Andrushchenko 2019-02-14 16:23:21 +02:00 committed by Juergen Gross
parent fa13e665e0
commit 068e79f4a9
1 changed files with 9 additions and 0 deletions
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9
drivers/xen/gntdev-dmabuf.c
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@ -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);
}