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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: bf8dc55b13 ("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>
This commit is contained in:
Oleksandr Andrushchenko 2020-08-13 09:21:09 +03:00 committed by Juergen Gross
parent f2e39e8c4f
commit 5fa4e6f1c2
1 changed files with 8 additions and 0 deletions
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8
drivers/xen/gntdev-dmabuf.c
View File

@ -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);