drm/vgem: off by one in vgem_gem_fault()
If page_offset is == num_pages then we end up reading beyond the end of
obj->pages[].
Fixes: af33a9190d
("drm/vgem: Enable dmabuf import interfaces")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180703122921.brlfxl4vx2ybvrd2@kili.mountain
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@ -74,7 +74,7 @@ static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
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num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
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if (page_offset > num_pages)
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if (page_offset >= num_pages)
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return VM_FAULT_SIGBUS;
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mutex_lock(&obj->pages_lock);
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