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([49.205.241.70]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bf239e5c29sm83725765ad.1.2026.05.31.08.27.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 May 2026 08:27:43 -0700 (PDT) From: Bharath Reddy To: syzbot+535ecc844591e50588a5@syzkaller.appspotmail.com Cc: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Bharath Reddy Subject: [PATCH v2] Bluetooth: fix memory leak in error path of hci_alloc_dev() Date: Sun, 31 May 2026 20:57:29 +0530 Message-Id: <20260531152729.100461-1-kbreddy.rpbc@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <6a1b8c87.fbc46276.d3ed.0668.GAE@google.com> References: <6a1b8c87.fbc46276.d3ed.0668.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git= f377d0025eb0 Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device. Reported-by: syzbot+535ecc844591e50588a5@syzkaller.appspotmail.com Signed-off-by: Bharath Reddy Tested-by: syzbot+535ecc844591e50588a5@syzkaller.appspotmail.com --- net/bluetooth/hci_sysfs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c index 041ce9adc378..74131f2c3be6 100644 --- a/net/bluetooth/hci_sysfs.c +++ b/net/bluetooth/hci_sysfs.c @@ -85,8 +85,10 @@ static void bt_host_release(struct device *dev) =20 if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) hci_release_dev(hdev); - else + else { + cleanup_srcu_struct(&hdev->srcu); kfree(hdev); + } module_put(THIS_MODULE); } =20 --=20 2.34.1