drm/vmwgfx: Validate the box size for the snooped cursor

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commit 4cf949c7fa upstream.

Invalid userspace dma surface copies could potentially overflow
the memcpy from the surface to the snooped image leading to crashes.
To fix it the dimensions of the copybox have to be validated
against the expected size of the snooped cursor.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Fixes: 2ac863719e ("vmwgfx: Snoop DMA transfers with non-covering sizes")
Cc: <stable@vger.kernel.org> # v3.2+
Reviewed-by: Michael Banack <banackm@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026031936.1004280-1-zack@kde.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Zack Rusin 2022-10-25 23:19:35 -04:00 • committed by Greg Kroah-Hartman

parent d988f0bcf5

commit 622d527dec

1 changed files with 2 additions and 1 deletions

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drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

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