================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 Read of size 1 at addr ffff88811516aa67 by task syz-executor/494 CPU: 0 PID: 494 Comm: syz-executor Not tainted 5.10.226-syzkaller-1003431-ge5e5644ea27f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 ext4_dx_readdir fs/ext4/dir.c:598 [inline] ext4_readdir+0x2dde/0x37c0 fs/ext4/dir.c:142 iterate_dir+0x265/0x580 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f48dc5ae193 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 42 43 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffec7396d28 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055556fa5a4e0 RCX: 00007f48dc5ae193 RDX: 0000000000008000 RSI: 000055556fa5a4e0 RDI: 0000000000000005 RBP: 000055556fa5a4b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007f48dc709ca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 000055556fa5a4b0 R15: 00007ffec7398fd0 Allocated by task 494: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1aa/0x330 mm/slub.c:4033 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] kvmalloc_array include/linux/mm.h:840 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x25e/0x7a0 net/sched/sch_generic.c:779 qdisc_create_dflt+0x138/0x3d0 net/sched/sch_generic.c:931 attach_one_default_qdisc net/sched/sch_generic.c:1087 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2321 [inline] attach_default_qdiscs net/sched/sch_generic.c:1105 [inline] dev_activate+0x2e0/0x1310 net/sched/sch_generic.c:1164 __dev_open+0x3bf/0x4e0 net/core/dev.c:1551 __dev_change_flags+0x1db/0x6e0 net/core/dev.c:8514 dev_change_flags+0x8c/0x1a0 net/core/dev.c:8585 do_setlink+0xc5c/0x3c30 net/core/rtnetlink.c:2729 __rtnl_newlink net/core/rtnetlink.c:3407 [inline] rtnl_newlink+0x15f0/0x2000 net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5607 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2499 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x545/0x700 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2014 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888115168000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2663 bytes to the right of 8192-byte region [ffff888115168000, ffff88811516a000) The buggy address belongs to the page: page:ffffea0004545a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115168 head:ffffea0004545a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042a80 raw: 0000000000000000 0000000000020002 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 494, ts 52015678219, free_ts 52003860493 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 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+0x204/0x330 mm/slub.c:4029 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] kvmalloc_array include/linux/mm.h:840 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x25e/0x7a0 net/sched/sch_generic.c:779 qdisc_create_dflt+0x138/0x3d0 net/sched/sch_generic.c:931 attach_one_default_qdisc net/sched/sch_generic.c:1087 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2321 [inline] attach_default_qdiscs net/sched/sch_generic.c:1105 [inline] dev_activate+0x2e0/0x1310 net/sched/sch_generic.c:1164 __dev_open+0x3bf/0x4e0 net/core/dev.c:1551 __dev_change_flags+0x1db/0x6e0 net/core/dev.c:8514 dev_change_flags+0x8c/0x1a0 net/core/dev.c:8585 do_setlink+0xc5c/0x3c30 net/core/rtnetlink.c:2729 __rtnl_newlink net/core/rtnetlink.c:3407 [inline] rtnl_newlink+0x15f0/0x2000 net/core/rtnetlink.c:3527 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_trace+0x163/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] syslog_print+0x121/0x860 kernel/printk/printk.c:1487 do_syslog+0x90e/0x970 kernel/printk/printk.c:1644 Memory state around the buggy address: ffff88811516a900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811516a980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811516aa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811516aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811516ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================