drm: drm_ioctl() should zero-init extra data
If an older userspace passes in a smaller arg than the current kernel ioctl arg struct, then extra fields should be initialized to zero rather than passing random data to the DRM driver. Signed-off-by: Rob Clark <rob@ti.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -438,6 +438,8 @@ long drm_ioctl(struct file *filp,
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goto err_i1;
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}
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}
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if (asize > usize)
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memset(kdata + usize, 0, asize - usize);
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}
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if (cmd & IOC_IN) {
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