Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "net/bluetooth/l2cap_core.c"
                    ],
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bluetooth/l2cap_core.c"
                    ],
                    "versions": [
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                            "versionType": "semver"
                        },
                        {
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                        },
                        {
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                            "versionType": "semver"
                        }
                    ]
                }