Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/bluetooth/hci_ldisc.c"
                    ],
                    "versions": [
                        {
                            "version": "a40f94f7caa8d3421b64f63ac31bc0f24c890f39",
                            "lessThan": "b0a900939e7e4866d9b90e9112514b72c451e873",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9e5a0f5777162e503400c70c6ed25fbbe2d38799",
                            "lessThan": "ccc683f597ceb28deb966427ae948e5ac739a909",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "80f14e9de6a43a0bd8194cad1003a3e6dcbc3984",
                            "lessThan": "937a573423ce5a96fdb1fd425dc6b8d8d4ab5779",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "02e1bcdfdf769974e7e9fa285e295cd9852e2a38",
                            "lessThan": "186d147cf7689ba1f9b3ddb753ab634a84940cc9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "281782d2c6730241e300d630bb9f200d831ede71",
                            "lessThan": "53e54cb31e667fca05b1808b990eac0807d1dab0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5df5dafc171b90d0b8d51547a82657cd5a1986c7",
                            "lessThan": "03e8c90c62233382042b7bd0fa8b8900552fdb62",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5df5dafc171b90d0b8d51547a82657cd5a1986c7",
                            "lessThan": "0c3cd7a0b862c37acbee6d9502107146cc944398",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1dcf08fcff5ca529de6dc0395091f28854f4e54a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8e5aff600539e5faea294d9612cca50220e602b8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "db7509fa110dd9b11134b75894677f30353b2c51",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.10.237",
                            "lessThan": "5.10.249",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.181",
                            "lessThan": "5.15.199",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.135",
                            "lessThan": "6.1.162",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.88",
                            "lessThan": "6.6.123",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.24",
                            "lessThan": "6.12.69",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.293",
                            "lessThan": "5.5",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.13.12",
                            "lessThan": "6.14",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.14.3",
                            "lessThan": "6.15",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/bluetooth/hci_ldisc.c"
                    ],
                    "versions": [
                        {
                            "version": "6.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.249",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.199",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.162",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.123",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.69",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.9",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }