KASAN: use-after-free Read in h5_rx_3wire

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in h5_rx_3wire_hdr bluetooth	syz	error		3	1195d	1961d	0/28	auto-obsoleted due to no activity on 2023/04/15 21:58
linux-4.14	KASAN: use-after-free Read in h5_rx_3wire_hdr	syz		inconclusive	2	1634d	1964d	0/1	upstream: reported syz repro on 2019/07/20 02:11
linux-4.19	KASAN: use-after-free Read in h5_rx_3wire_hdr				2	1698d	1740d	0/1	auto-closed as invalid on 2020/08/08 17:48

Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum ================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:43 [inline] BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:967 [inline] BUG: KASAN: use-after-free in kfree_skb+0x32/0x3d0 net/core/skbuff.c:668 Read of size 4 at addr ffff88809e42d9a4 by task kworker/u4:2/43 CPU: 1 PID: 43 Comm: kworker/u4:2 Not tainted 4.19.196-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report+0x8f/0xa0 mm/kasan/report.c:412 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:43 [inline] skb_unref include/linux/skbuff.h:967 [inline] kfree_skb+0x32/0x3d0 net/core/skbuff.c:668 h5_reset_rx drivers/bluetooth/hci_h5.c:546 [inline] h5_rx_3wire_hdr+0x43a/0x7f0 drivers/bluetooth/hci_h5.c:456 h5_recv+0x370/0x6c0 drivers/bluetooth/hci_h5.c:579 hci_uart_tty_receive+0x221/0x530 drivers/bluetooth/hci_ldisc.c:621 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:460 tty_port_default_receive_buf+0x78/0xa0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:476 [inline] flush_to_ldisc+0x21f/0x390 drivers/tty/tty_buffer.c:528 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Allocated by task 43: kmem_cache_alloc_node+0x146/0x3b0 mm/slab.c:3649 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] h5_rx_pkt_start+0xd1/0x360 drivers/bluetooth/hci_h5.c:490 h5_recv+0x370/0x6c0 drivers/bluetooth/hci_h5.c:579 hci_uart_tty_receive+0x221/0x530 drivers/bluetooth/hci_ldisc.c:621 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:460 tty_port_default_receive_buf+0x78/0xa0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:476 [inline] flush_to_ldisc+0x21f/0x390 drivers/tty/tty_buffer.c:528 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 6016: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] kfree_skb+0x127/0x3d0 net/core/skbuff.c:672 h5_reset_rx drivers/bluetooth/hci_h5.c:546 [inline] h5_rx_3wire_hdr+0x43a/0x7f0 drivers/bluetooth/hci_h5.c:456 h5_recv+0x370/0x6c0 drivers/bluetooth/hci_h5.c:579 hci_uart_tty_receive+0x221/0x530 drivers/bluetooth/hci_ldisc.c:621 tiocsti drivers/tty/tty_io.c:2194 [inline] tty_ioctl+0xff8/0x15c0 drivers/tty/tty_io.c:2580 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809e42d8c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 228 bytes inside of 232-byte region [ffff88809e42d8c0, ffff88809e42d9a8) The buggy address belongs to the page: page:ffffea0002790b40 count:1 mapcount:0 mapping:ffff8880b5b96900 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002921648 ffffea0002a87788 ffff8880b5b96900 raw: 0000000000000000 ffff88809e42d000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809e42d880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88809e42d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809e42d980: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809e42da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e42da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ================================================================== Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum Bluetooth: Invalid header checksum audit: type=1804 audit(1625170492.557:991): pid=6030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir549825595/syzkaller.GMLeDz/2801/bus" dev="sda1" ino=14312 res=1