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There is a potential integer overflow in drm_mode_dirtyfb_ioctl() if userspace passes in a large num_clips. The call to kmalloc would allocate a small buffer, and the call to fb->funcs->dirty may result in a memory corruption. Reported-by: Haogang Chen <[email protected]> Signed-off-by: Xi Wang <[email protected]> Cc: [email protected] Signed-off-by: Dave Airlie <[email protected]>