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[107.146.107.67]) by smtp.gmail.com with ESMTPSA id 3f1490d57ef6-e39f6a42f31sm2556098276.4.2024.12.09.12.58.44 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2024 12:58:44 -0800 (PST) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v1 1/3] shared/gatt-db: Fix possible crash on gatt_db_clone Date: Mon, 9 Dec 2024 15:58:41 -0500 Message-ID: <20241209205843.1394081-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz The following crash can happen if the original gatt_db has incomplete service definitions since the attribute might still be discovering: Invalid read of size 4 at 0x1E5A39: bt_uuid_len (uuid.h:289) by 0x1E5A39: service_clone (gatt-db.c:284) by 0x1D5EBB: queue_foreach (queue.c:207) by 0x1E61CD: gatt_db_clone (gatt-db.c:329) by 0x1C18F0: btd_device_set_gatt_db (device.c:7110) by 0x1C9F96: foreach_rsi (set.c:295) by 0x1D5EBB: queue_foreach (queue.c:207) by 0x48EA91F: g_slist_foreach (in /usr/lib64/libglib-2.0.so.0.8000.3) by 0x1CA2C8: btd_set_add_device (set.c:357) by 0x1BB9AB: btd_device_add_set (device.c:2049) by 0x17FF76: csip_ready (csip.c:243) by 0x1FD5CC: csip_notify_ready (csip.c:546) by 0x1FD5CC: csip_idle (csip.c:630) by 0x1DE20C: idle_notify (gatt-client.c:171) Address 0xc is not stack'd, malloc'd or (recently) free'd --- src/shared/gatt-db.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/shared/gatt-db.c b/src/shared/gatt-db.c index b35763410d17..72254c7e41ba 100644 --- a/src/shared/gatt-db.c +++ b/src/shared/gatt-db.c @@ -278,6 +278,9 @@ static void service_clone(void *data, void *user_data) for (i = 0; i < service->num_handles; i++) { struct gatt_db_attribute *attr = service->attributes[i]; + if (!attr) + continue; + /* Only clone values for characteristics declaration since that * is considered when calculating the db hash. */