================================================================== BUG: KASAN: slab-out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2594 [inline] BUG: KASAN: slab-out-of-bounds in ext4_ext_remove_space+0x3da3/0x4e10 fs/ext4/extents.c:2932 Read of size 4 at addr ffff88810fc62c18 by task syz.3.2102/8389 CPU: 1 PID: 8389 Comm: syz.3.2102 Tainted: G W 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_ext_rm_leaf fs/ext4/extents.c:2594 [inline] ext4_ext_remove_space+0x3da3/0x4e10 fs/ext4/extents.c:2932 ext4_ext_truncate+0x17f/0x200 fs/ext4/extents.c:4465 ext4_truncate+0xb19/0x1220 fs/ext4/inode.c:4366 ext4_evict_inode+0xf07/0x1730 fs/ext4/inode.c:290 evict+0x526/0x9c0 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x632/0x7e0 fs/inode.c:1762 dentry_unlink_inode+0x2ea/0x3d0 fs/dcache.c:378 __dentry_kill+0x447/0x650 fs/dcache.c:583 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x40/0x80 fs/dcache.c:883 __fput+0x52e/0x7b0 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xc83/0x2a50 kernel/exit.c:863 do_group_exit+0x141/0x310 kernel/exit.c:985 get_signal+0x10a0/0x1410 kernel/signal.c:2793 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:291 RIP: 0033:0x7fbd03e159c9 Code: Unable to access opcode bytes at RIP 0x7fbd03e1599f. RSP: 002b:00007fbd023e81c0 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: 0000000000000000 RBX: 00007fbd03d97dd0 RCX: 00007fbd03e159c9 RDX: 00007fbd03d97dd0 RSI: 0000000000000058 RDI: 00007ffd630aa780 RBP: 00007fbd023e86c0 R08: 00007fbd023e86c0 R09: 00007ffd630aa867 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000006e R14: 00007ffd630aa780 R15: 00007ffd630aa868 Allocated by task 0: (stack is not available) Freed by task 8031: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x5c6/0x6f0 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] kfree_skb+0xb9/0x320 net/core/skbuff.c:713 tipc_msg_reverse+0x18b/0x9b0 net/tipc/msg.c:676 tipc_sk_respond+0x14c/0x340 net/tipc/socket.c:281 tsk_rej_rx_queue net/tipc/socket.c:300 [inline] __tipc_shutdown+0xae1/0x1510 net/tipc/socket.c:564 tipc_release+0x76/0x1440 net/tipc/socket.c:629 __sock_release net/socket.c:597 [inline] sock_close+0xdf/0x270 net/socket.c:1286 __fput+0x33d/0x7b0 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88810fc62800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes to the right of 1024-byte region [ffff88810fc62800, ffff88810fc62c00) The buggy address belongs to the page: page:ffffea00043f1800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10fc60 head:ffffea00043f1800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8032, ts 372815726185, free_ts 372814127860 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xbc/0x510 net/core/skbuff.c:212 __pskb_copy_fclone+0xae/0x1180 net/core/skbuff.c:1578 __pskb_copy include/linux/skbuff.h:1190 [inline] tipc_sk_mcast_rcv+0x5d7/0x10b0 net/tipc/socket.c:1237 tipc_mcast_xmit+0x144a/0x1b30 net/tipc/bcast.c:424 tipc_send_group_bcast+0x843/0xb50 net/tipc/socket.c:1114 __tipc_sendmsg+0x1364/0x3ab0 net/tipc/socket.c:-1 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1391 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629 free_the_page+0x76/0x370 mm/page_alloc.c:5409 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab mm/slub.c:1915 [inline] unfreeze_partials+0x15e/0x190 mm/slub.c:2410 put_cpu_partial+0xbf/0x180 mm/slub.c:2446 __slab_free+0x2c8/0x3a0 mm/slub.c:3095 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960 kmem_cache_alloc_node include/linux/slab.h:423 [inline] __alloc_skb+0x80/0x510 net/core/skbuff.c:200 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] tipc_buf_acquire net/tipc/msg.c:74 [inline] tipc_msg_build+0x13e/0x1040 net/tipc/msg.c:394 Memory state around the buggy address: ffff88810fc62b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810fc62b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810fc62c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88810fc62c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810fc62d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================