================================================================== BUG: KASAN: slab-use-after-free in __list_add_valid+0x4c/0x110 lib/list_debug.c:27 Read of size 8 at addr ffff0000d2c0b008 by task syz-executor.1/8637 CPU: 1 PID: 8637 Comm: syz-executor.1 Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x174/0x514 mm/kasan/report.c:462 kasan_report+0xd4/0x130 mm/kasan/report.c:572 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __list_add_valid+0x4c/0x110 lib/list_debug.c:27 __list_add include/linux/list.h:69 [inline] list_add include/linux/list.h:88 [inline] nfc_llcp_register_device+0x58c/0x6bc net/nfc/llcp_core.c:1604 nfc_register_device+0x8c/0x310 net/nfc/core.c:1124 nci_register_device+0x6ac/0x7c4 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x13c/0x1bc drivers/nfc/virtual_ncidev.c:148 misc_open+0x2f0/0x368 drivers/char/misc.c:165 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x724/0xf90 fs/open.c:920 vfs_open+0x7c/0x90 fs/open.c:1051 do_open fs/namei.c:3636 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3791 do_filp_open+0x1bc/0x3cc fs/namei.c:3818 do_sys_openat2+0x128/0x3d8 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1383 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 6920: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] kmalloc_trace+0x70/0x88 mm/slab_common.c:1062 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] nfc_llcp_register_device+0x60/0x6bc net/nfc/llcp_core.c:1567 nfc_register_device+0x8c/0x310 net/nfc/core.c:1124 nci_register_device+0x6ac/0x7c4 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x13c/0x1bc drivers/nfc/virtual_ncidev.c:148 misc_open+0x2f0/0x368 drivers/char/misc.c:165 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x724/0xf90 fs/open.c:920 vfs_open+0x7c/0x90 fs/open.c:1051 do_open fs/namei.c:3636 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3791 do_filp_open+0x1bc/0x3cc fs/namei.c:3818 do_sys_openat2+0x128/0x3d8 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1383 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000d2c0b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 8 bytes inside of freed 2048-byte region [ffff0000d2c0b000, ffff0000d2c0b800) The buggy address belongs to the physical page: page:0000000034fcc201 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000d2c0c000 pfn:0x112c08 head:0000000034fcc201 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000010200 ffff0000c0002900 fffffc00031e1e10 fffffc00049f7010 raw: ffff0000d2c0c000 0000000000080001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d2c0af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d2c0af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d2c0b000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d2c0b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d2c0b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_add corruption. next->prev should be prev (ffff800090afc840), but was 058a03fd00001b02. (next=ffff0000d2c0b000). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 8637 Comm: syz-executor.1 Tainted: G B 6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __list_add_valid+0xf4/0x110 lib/list_debug.c:27 lr : __list_add_valid+0xf4/0x110 lib/list_debug.c:27 sp : ffff8000983872f0 x29: ffff8000983872f0 x28: dfff800000000000 x27: 1fffe000250ef60d x26: 1fffe000250ef801 x25: 1fffe000250ef800 x24: dfff800000000000 x23: dfff800000000000 x22: ffff0000d2c0b008 x21: ffff00012877c000 x20: ffff800090afc840 x19: ffff0000d2c0b000 x18: 1fffe00036842fc6 x17: 3034386366613039 x16: ffff80008a4403e0 x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000040000 x10: 000000000003ffff x9 : 2fde76894c9afe00 x8 : 2fde76894c9afe00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800098386bf8 x4 : ffff80008dfbee80 x3 : ffff800080597614 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000075 Call trace: __list_add_valid+0xf4/0x110 lib/list_debug.c:27 __list_add include/linux/list.h:69 [inline] list_add include/linux/list.h:88 [inline] nfc_llcp_register_device+0x58c/0x6bc net/nfc/llcp_core.c:1604 nfc_register_device+0x8c/0x310 net/nfc/core.c:1124 nci_register_device+0x6ac/0x7c4 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x13c/0x1bc drivers/nfc/virtual_ncidev.c:148 misc_open+0x2f0/0x368 drivers/char/misc.c:165 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x724/0xf90 fs/open.c:920 vfs_open+0x7c/0x90 fs/open.c:1051 do_open fs/namei.c:3636 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3791 do_filp_open+0x1bc/0x3cc fs/namei.c:3818 do_sys_openat2+0x128/0x3d8 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1383 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: 91288000 aa1403e1 aa1303e3 95e4cf83 (d4210000) ---[ end trace 0000000000000000 ]---