================================================================== BUG: KASAN: use-after-free in crc16+0x1c0/0x280 lib/crc16.c:58 Read of size 1 at addr ffff888058298000 by task syz-executor.3/12988 CPU: 1 PID: 12988 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x163/0x4f0 mm/kasan/report.c:417 kasan_report+0x13a/0x170 mm/kasan/report.c:517 crc16+0x1c0/0x280 lib/crc16.c:58 ext4_group_desc_csum+0x90f/0xc50 fs/ext4/super.c:3187 ext4_group_desc_csum_set+0x19b/0x240 fs/ext4/super.c:3210 ext4_free_inode+0x954/0x10c0 fs/ext4/ialloc.c:332 ext4_evict_inode+0xe11/0x1230 fs/ext4/inode.c:331 evict+0x2a4/0x620 fs/inode.c:664 do_unlinkat+0x4f1/0x930 fs/namei.c:4327 __do_sys_unlink fs/namei.c:4368 [inline] __se_sys_unlink fs/namei.c:4366 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4366 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6e1848c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e191d2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f6e185ac050 RCX: 00007f6e1848c0f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0 RBP: 00007f6e184e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc55fa5a1f R14: 00007f6e191d2300 R15: 0000000000022000 Allocated by task 5955: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 __kasan_slab_alloc+0x69/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x68/0x390 mm/slab.h:761 slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x12c/0x280 mm/slub.c:3476 getname_flags+0xbc/0x4e0 fs/namei.c:139 vfs_fstatat fs/stat.c:269 [inline] __do_sys_newfstatat fs/stat.c:440 [inline] __se_sys_newfstatat+0xe6/0x7c0 fs/stat.c:434 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5955: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:523 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x2b5/0x580 mm/slub.c:3809 vfs_fstatat fs/stat.c:271 [inline] __do_sys_newfstatat fs/stat.c:440 [inline] __se_sys_newfstatat+0x112/0x7c0 fs/stat.c:434 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888058298000 which belongs to the cache names_cache of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff888058298000, ffff888058299000) The buggy address belongs to the physical page: page:ffffea000160a600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58298 head:ffffea000160a600 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012625780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4424, tgid 4424 (udevd), ts 200742974243, free_ts 200558791188 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x3449/0x35c0 mm/page_alloc.c:4283 __alloc_pages+0x291/0x7e0 mm/page_alloc.c:5549 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x1b0/0x280 mm/slub.c:3476 getname_flags+0xbc/0x4e0 fs/namei.c:139 vfs_fstatat fs/stat.c:269 [inline] __do_sys_newfstatat fs/stat.c:440 [inline] __se_sys_newfstatat+0xe6/0x7c0 fs/stat.c:434 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare mm/page_alloc.c:1496 [inline] free_unref_page_prepare+0xf3a/0x1040 mm/page_alloc.c:3369 free_unref_page+0x37/0x3f0 mm/page_alloc.c:3464 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x68/0x390 mm/slab.h:761 slab_alloc_node mm/slub.c:3452 [inline] kmem_cache_alloc_node+0x158/0x2c0 mm/slub.c:3497 __alloc_skb+0xd6/0x2d0 net/core/skbuff.c:552 alloc_skb include/linux/skbuff.h:1270 [inline] nlmsg_new include/net/netlink.h:1002 [inline] rtmsg_ifinfo_build_skb+0x85/0x1b0 net/core/rtnetlink.c:3948 rtmsg_ifinfo_event net/core/rtnetlink.c:3986 [inline] rtmsg_ifinfo+0xcb/0x200 net/core/rtnetlink.c:3995 netdev_state_change+0x1c8/0x250 net/core/dev.c:1321 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:182 __linkwatch_run_queue+0x44c/0x6c0 net/core/link_watch.c:235 linkwatch_event+0x4c/0x60 net/core/link_watch.c:278 process_one_work+0x8fa/0x1370 kernel/workqueue.c:2289 worker_thread+0xa63/0x1210 kernel/workqueue.c:2436 Memory state around the buggy address: ffff888058297f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888058297f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888058298000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888058298080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888058298100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================