drm/vmwgfx: bound DMA command body size against suffix pointer

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c"
                    ],
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                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.33",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.33",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.265",
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                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.216",
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                        },
                        {
                            "version": "6.1.183",
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                        },
                        {
                            "version": "6.6.151",
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                        },
                        {
                            "version": "6.12.103",
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                        },
                        {
                            "version": "6.18.44",
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                        },
                        {
                            "version": "7.1.8",
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                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }