================================================================== BUG: KASAN: use-after-free in skb_put_data include/linux/skbuff.h:2293 [inline] BUG: KASAN: use-after-free in h4_recv_buf+0x3d5/0xd00 drivers/bluetooth/hci_h4.c:200 Write of size 1 at addr ffff88806243d00c by task syz-executor.0/10259 CPU: 0 PID: 10259 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 print_address_description+0x5f/0x3a0 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report+0x15e/0x210 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:186 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 skb_put_data include/linux/skbuff.h:2293 [inline] h4_recv_buf+0x3d5/0xd00 drivers/bluetooth/hci_h4.c:200 h4_recv+0xf4/0x1b0 drivers/bluetooth/hci_h4.c:115 hci_uart_tty_receive+0x157/0x490 drivers/bluetooth/hci_ldisc.c:613 tiocsti drivers/tty/tty_io.c:2317 [inline] tty_ioctl+0xc64/0x15f0 drivers/tty/tty_io.c:2718 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb4a52aa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020000000 RSI: 0000000000005412 RDI: 0000000000000003 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc4fc6b23f R14: 00007fb4a52aa300 R15: 0000000000022000 Allocated by task 0: (stack is not available) Freed by task 9934: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:357 ____kasan_slab_free+0x100/0x140 mm/kasan/common.c:360 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x171/0x270 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xcf/0x2d0 mm/slub.c:4213 skb_release_all net/core/skbuff.c:725 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:739 h4_recv_buf+0xcdb/0xd00 include/net/bluetooth/bluetooth.h:390 h4_recv+0xf4/0x1b0 drivers/bluetooth/hci_h4.c:115 hci_uart_tty_receive+0x157/0x490 drivers/bluetooth/hci_ldisc.c:613 tty_ldisc_receive_buf+0x12b/0x170 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x6a/0x90 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x2f2/0x510 drivers/tty/tty_buffer.c:533 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff88806243d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 12 bytes inside of 2048-byte region [ffff88806243d000, ffff88806243d800) The buggy address belongs to the page: page:000000004c9987b8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62438 head:000000004c9987b8 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842000 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806243cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806243cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806243d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806243d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806243d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================