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Subject[Xen-devel][PATCH 2/2] xen/gntdev: Check and release imported dma-bufs on close
Date
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

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>
---
drivers/xen/gntdev-dmabuf.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
index d97fcfc5e558..2c4f324f8626 100644
--- a/drivers/xen/gntdev-dmabuf.c
+++ b/drivers/xen/gntdev-dmabuf.c
@@ -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);
}
--
2.20.1
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