R13: 00007f1b71226038 R14: 00007f1b71225fa0 R15: 00007fff6e7d8248 ================================================================== BUG: KASAN: double-free in jffs2_free_inode+0x39/0x60 fs/jffs2/super.c:52 Free of addr ffff888026e13200 by task syz.5.3156/18985 CPU: 3 UID: 0 PID: 18985 Comm: syz.5.3156 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report_invalid_free+0xb8/0x190 mm/kasan/report.c:557 check_slab_allocation+0xc3/0xf0 mm/kasan/common.c:235 kasan_slab_pre_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:2622 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1b6/0x6c0 mm/slub.c:6692 jffs2_free_inode+0x39/0x60 fs/jffs2/super.c:52 i_callback fs/inode.c:317 [inline] alloc_inode+0x153/0x250 fs/inode.c:352 iget_locked+0x1d9/0x6d0 fs/inode.c:1473 jffs2_iget+0xb5/0xe30 fs/jffs2/fs.c:265 jffs2_lookup+0x353/0x410 fs/jffs2/dir.c:114 lookup_one_qstr_excl+0x1cd/0x250 fs/namei.c:1810 __start_dirop fs/namei.c:2920 [inline] start_dirop fs/namei.c:2942 [inline] filename_create+0x1cf/0x400 fs/namei.c:5092 filename_symlinkat+0xe1/0x560 fs/namei.c:5813 __do_sys_symlink fs/namei.c:5846 [inline] __se_sys_symlink fs/namei.c:5842 [inline] __x64_sys_symlink+0x79/0xb0 fs/namei.c:5842 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1b70f9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1b71ea8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f1b71225fa0 RCX: 00007f1b70f9e0d9 RDX: 0000000000000000 RSI: 0000200000000800 RDI: 0000200000000540 RBP: 00007f1b71ea8090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f1b71226038 R14: 00007f1b71225fa0 R15: 00007fff6e7d8248 Allocated by task 10782: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_noprof+0x324/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kmalloc_array_noprof include/linux/slab.h:1208 [inline] security_inode_init_security+0x113/0x370 security/security.c:1347 shmem_mknod+0x2ce/0x480 mm/shmem.c:3814 lookup_open+0x1255/0x1990 fs/namei.c:4567 open_last_lookups fs/namei.c:4767 [inline] path_openat+0xa2c/0x2440 fs/namei.c:4997 do_file_open+0x20e/0x430 fs/namei.c:5029 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10782: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x22b/0x6c0 mm/slub.c:6692 security_inode_init_security+0x2bf/0x370 security/security.c:1374 shmem_mknod+0x2ce/0x480 mm/shmem.c:3814 lookup_open+0x1255/0x1990 fs/namei.c:4567 open_last_lookups fs/namei.c:4767 [inline] path_openat+0xa2c/0x2440 fs/namei.c:4997 do_file_open+0x20e/0x430 fs/namei.c:5029 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888026e13200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff888026e13200, ffff888026e13300) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26e12 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c042b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c042b40 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 37, tgid 37 (kdevtmpfs), ts 6361332327, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf46/0x3500 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x660 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_noprof+0x66b/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kmalloc_array_noprof include/linux/slab.h:1208 [inline] security_inode_init_security+0x113/0x370 security/security.c:1347 shmem_mknod+0x2ce/0x480 mm/shmem.c:3814 vfs_mknod+0x3a5/0x7f0 fs/namei.c:5269 handle_create drivers/base/devtmpfs.c:232 [inline] handle drivers/base/devtmpfs.c:384 [inline] devtmpfs_work_loop+0x48d/0xae4 drivers/base/devtmpfs.c:399 devtmpfsd+0x3f/0x50 drivers/base/devtmpfs.c:441 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page_owner free stack trace missing Memory state around the buggy address: ffff888026e13100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888026e13180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888026e13200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026e13280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026e13300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================