CVE-2022-50419

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times

device_add shall not be called multiple times as stated in its documentation:

Do not call this routine or device_register() more than once for any device structure

Syzkaller reports a bug as follows [1]: ————[ cut here ]———— kernel BUG at lib/list_debug.c:33! invalid opcode: 0000 [#1] PREEMPT SMP KASAN […] Call Trace: __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] kobj_kset_join lib/kobject.c:164 [inline] kobject_add_internal+0x18f/0x8f0 lib/kobject.c:214 kobject_add_varg lib/kobject.c:358 [inline] kobject_add+0x150/0x1c0 lib/kobject.c:410 device_add+0x368/0x1e90 drivers/base/core.c:3452 hci_conn_add_sysfs+0x9b/0x1b0 net/bluetooth/hci_sysfs.c:53 hci_le_cis_estabilished_evt+0x57c/0xae0 net/bluetooth/hci_event.c:6799 hci_le_meta_evt+0x2b8/0x510 net/bluetooth/hci_event.c:7110 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x63d/0xfd0 net/bluetooth/hci_event.c:7495 hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Affected Software

References

• https://git.kernel.org/stable/c/1b6c89571f453101251201f0fad1c26f7256e937
• https://git.kernel.org/stable/c/3423a50fa018e88aed4c900d59c3c8334d8ad583
• https://git.kernel.org/stable/c/448a496f760664d3e2e79466aa1787e6abc922b5
• https://git.kernel.org/stable/c/4bcefec3636208b4c97536b26014d5935d5c10a0
• https://git.kernel.org/stable/c/6144423712d570247b8ca26e50a277c30dd13702
• https://git.kernel.org/stable/c/671fee73e08ff415d36a7c16bdf238927df83884
• https://git.kernel.org/stable/c/6e85d2ad958c6f034b1b158d904019869dbb3c81
• https://git.kernel.org/stable/c/7b674dce4162bb46d396586e30e4653427023875
• https://git.kernel.org/stable/c/ef055094df4c10b73cfe67c8d43f9de1fb608a8b