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authorOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>2020-08-13 09:21:09 +0300
committerJuergen Gross <jgross@suse.com>2020-08-13 13:50:22 +0300
commit5fa4e6f1c2d8c9a4e47e1931b42893172d388f2b (patch)
tree88ff3e420ef0fae924ee6bb9adf3f8d79051e704 /drivers/xen/gntdev-dmabuf.c
parentf2e39e8c4f0c13bc4b49f942be8fd5b4b0470412 (diff)
downloadlinux-5fa4e6f1c2d8c9a4e47e1931b42893172d388f2b.tar.xz
xen/gntdev: Fix dmabuf import with non-zero sgt offset
It is possible that the scatter-gather table during dmabuf import has non-zero offset of the data, but user-space doesn't expect that. Fix this by failing the import, so user-space doesn't access wrong data. Fixes: bf8dc55b1358 ("xen/gntdev: Implement dma-buf import functionality") Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Acked-by: Juergen Gross <jgross@suse.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200813062113.11030-2-andr2000@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen/gntdev-dmabuf.c')
-rw-r--r--drivers/xen/gntdev-dmabuf.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
index 75d3bb948bf3..b1b6eebafd5d 100644
--- a/drivers/xen/gntdev-dmabuf.c
+++ b/drivers/xen/gntdev-dmabuf.c
@@ -613,6 +613,14 @@ dmabuf_imp_to_refs(struct gntdev_dmabuf_priv *priv, struct device *dev,
goto fail_detach;
}
+ /* Check that we have zero offset. */
+ if (sgt->sgl->offset) {
+ ret = ERR_PTR(-EINVAL);
+ pr_debug("DMA buffer has %d bytes offset, user-space expects 0\n",
+ sgt->sgl->offset);
+ goto fail_unmap;
+ }
+
/* Check number of pages that imported buffer has. */
if (attach->dmabuf->size != gntdev_dmabuf->nr_pages << PAGE_SHIFT) {
ret = ERR_PTR(-EINVAL);