EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue ext4 filesystem being mounted at /root/syzkaller-testdir498752945/syzkaller.dLheZN/1577/bus supports timestamps until 2038 (0x7fffffff) ================================================================== BUG: KASAN: use-after-free in crc16+0x235/0x2d0 lib/crc16.c:58 Read of size 1 at addr ffff8881506c0000 by task syz-executor.4/31313 CPU: 0 PID: 31313 Comm: syz-executor.4 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 crc16+0x235/0x2d0 lib/crc16.c:58 ext4_group_desc_csum+0x851/0xb50 fs/ext4/super.c:2850 ext4_group_desc_csum_set+0x1d6/0x270 fs/ext4/super.c:2873 ext4_free_blocks+0x1b9e/0x2ad0 fs/ext4/mballoc.c:5527 ext4_remove_blocks+0xaf1/0x1180 fs/ext4/extents.c:2520 ext4_ext_rm_leaf+0xaa8/0x18c0 fs/ext4/extents.c:2704 ext4_ext_remove_space+0xf25/0x22a0 fs/ext4/extents.c:2952 ext4_ext_truncate+0x18a/0x210 fs/ext4/extents.c:4413 ext4_truncate+0xba0/0x1270 fs/ext4/inode.c:4356 ext4_evict_inode+0xf1e/0x1730 fs/ext4/inode.c:288 evict+0x2a3/0x6c0 fs/inode.c:577 iput_final fs/inode.c:1655 [inline] iput+0x61f/0x7d0 fs/inode.c:1681 do_unlinkat+0x51a/0x920 fs/namei.c:3982 __do_sys_unlink fs/namei.c:4022 [inline] __se_sys_unlink fs/namei.c:4020 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4020 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f3b70ee30f9 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:00007f3b6fc56168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f3b71002f80 RCX: 00007f3b70ee30f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 00007f3b70f3eae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1a27222f R14: 00007f3b6fc56300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea000541b000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1506c0 flags: 0x8000000000000000() raw: 8000000000000000 ffffea0005419008 ffffea0004443008 0000000000000000 raw: 0000000000000000 0000000000000006 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 31149, ts 2715031740368, free_ts 2715164904801 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2386 [inline] prep_new_page mm/page_alloc.c:2392 [inline] get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160 __vmalloc_area_node mm/vmalloc.c:2496 [inline] __vmalloc_node_range+0x33f/0x6d0 mm/vmalloc.c:2566 __vmalloc_node mm/vmalloc.c:2609 [inline] vzalloc+0x78/0x90 mm/vmalloc.c:2662 xt_counters_alloc+0x4c/0x60 net/netfilter/x_tables.c:1344 __do_replace+0xc3/0xa60 net/ipv4/netfilter/ip_tables.c:1048 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline] do_ipt_set_ctl+0x2c5d/0x3da0 net/ipv4/netfilter/ip_tables.c:1629 nf_setsockopt+0x27e/0x2a0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x2e89/0x43b0 net/ipv4/ip_sockglue.c:1435 tcp_setsockopt+0x238/0x3590 net/ipv4/tcp.c:3431 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3267 __sys_setsockopt+0x585/0x870 net/socket.c:2122 __do_sys_setsockopt net/socket.c:2133 [inline] __se_sys_setsockopt net/socket.c:2130 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2130 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1332 [inline] free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3293 [inline] free_unref_page mm/page_alloc.c:3347 [inline] free_the_page mm/page_alloc.c:5219 [inline] __free_pages+0x390/0x570 mm/page_alloc.c:5228 __vunmap+0x846/0x980 mm/vmalloc.c:2276 __vfree mm/vmalloc.c:2324 [inline] vfree+0x5c/0x80 mm/vmalloc.c:2355 __do_replace+0x7fe/0xa60 net/ipv4/netfilter/ip_tables.c:1087 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline] do_ipt_set_ctl+0x2c5d/0x3da0 net/ipv4/netfilter/ip_tables.c:1629 nf_setsockopt+0x27e/0x2a0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x2e89/0x43b0 net/ipv4/ip_sockglue.c:1435 tcp_setsockopt+0x238/0x3590 net/ipv4/tcp.c:3431 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3267 __sys_setsockopt+0x585/0x870 net/socket.c:2122 __do_sys_setsockopt net/socket.c:2133 [inline] __se_sys_setsockopt net/socket.c:2130 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2130 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Memory state around the buggy address: ffff8881506bff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881506bff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881506c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881506c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881506c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================