EXT4-fs warning (device loop0): dx_probe:892: inode #2: comm syz.0.35: dx entry: limit 0 != root limit 124 EXT4-fs warning (device loop0): dx_probe:965: inode #2: comm syz.0.35: Corrupt directory, running e2fsck is recommended ================================================================== BUG: KASAN: use-after-free in __ext4_check_dir_entry+0x6f3/0x870 fs/ext4/dir.c:85 Read of size 2 at addr ffff88801a33c003 by task syz.0.35/3701 CPU: 1 PID: 3701 Comm: syz.0.35 Not tainted 5.15.162-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 __ext4_check_dir_entry+0x6f3/0x870 fs/ext4/dir.c:85 ext4_readdir+0x14a6/0x38e0 fs/ext4/dir.c:258 iterate_dir+0x224/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f50ed8cebd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f50ec34f048 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f50eda5cf60 RCX: 00007f50ed8cebd9 RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007f50ed93daa1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f50eda5cf60 R15: 00007ffe337f0128 Allocated by task 3699: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 skb_clone+0x1bb/0x350 net/core/skbuff.c:1523 do_one_broadcast net/netlink/af_netlink.c:1459 [inline] netlink_broadcast_filtered+0x66c/0x11a0 net/netlink/af_netlink.c:1534 netlink_broadcast+0x35/0x50 net/netlink/af_netlink.c:1558 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline] kobject_uevent_net_broadcast+0x377/0x560 lib/kobject_uevent.c:409 kobject_uevent_env+0x567/0x8d0 lib/kobject_uevent.c:593 device_add+0xa4f/0xfd0 drivers/base/core.c:3393 cdev_device_add+0x19c/0x360 fs/char_dev.c:549 ib_uverbs_add_one+0x4e2/0x690 drivers/infiniband/core/uverbs_main.c:1157 add_client_context+0x527/0x890 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1df/0x430 drivers/infiniband/core/device.c:1331 ib_register_device+0x1094/0x1390 drivers/infiniband/core/device.c:1419 siw_device_register drivers/infiniband/sw/siw/siw_main.c:72 [inline] siw_newlink+0xa9d/0xf80 drivers/infiniband/sw/siw/siw_main.c:519 nldev_newlink+0x5a8/0x620 drivers/infiniband/core/nldev.c:1710 rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x6b6/0x9a0 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1920 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2431 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2485 __sys_sendmsg net/socket.c:2514 [inline] __do_sys_sendmsg net/socket.c:2523 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2521 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 2962: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x91/0x1f0 mm/slub.c:3515 skb_free_datagram+0x24/0xe0 net/core/datagram.c:325 netlink_recvmsg+0x5ef/0x1190 net/netlink/af_netlink.c:1999 ____sys_recvmsg+0x286/0x530 ___sys_recvmsg+0x1ec/0x690 net/socket.c:2692 __sys_recvmsg net/socket.c:2722 [inline] __do_sys_recvmsg net/socket.c:2732 [inline] __se_sys_recvmsg net/socket.c:2729 [inline] __x64_sys_recvmsg+0x1dc/0x2b0 net/socket.c:2729 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88801a33c000 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 3 bytes inside of 232-byte region [ffff88801a33c000, ffff88801a33c0e8) The buggy address belongs to the page: page:ffffea000068cf00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a33c flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888144bf1140 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3699, ts 56840512547, free_ts 56444974287 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233 skb_clone+0x1bb/0x350 net/core/skbuff.c:1523 do_one_broadcast net/netlink/af_netlink.c:1459 [inline] netlink_broadcast_filtered+0x66c/0x11a0 net/netlink/af_netlink.c:1534 netlink_broadcast+0x35/0x50 net/netlink/af_netlink.c:1558 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline] kobject_uevent_net_broadcast+0x377/0x560 lib/kobject_uevent.c:409 kobject_uevent_env+0x567/0x8d0 lib/kobject_uevent.c:593 device_add+0xa4f/0xfd0 drivers/base/core.c:3393 cdev_device_add+0x19c/0x360 fs/char_dev.c:549 ib_uverbs_add_one+0x4e2/0x690 drivers/infiniband/core/uverbs_main.c:1157 add_client_context+0x527/0x890 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1df/0x430 drivers/infiniband/core/device.c:1331 ib_register_device+0x1094/0x1390 drivers/infiniband/core/device.c:1419 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0xfb/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] devlink_trap_register net/core/devlink.c:10909 [inline] devlink_traps_register+0x3dc/0xa60 net/core/devlink.c:11001 nsim_dev_traps_init+0x26a/0x500 drivers/net/netdevsim/dev.c:815 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1403 [inline] nsim_dev_reload_up+0x3f0/0x970 drivers/net/netdevsim/dev.c:910 devlink_reload+0x31a/0x750 net/core/devlink.c:3970 devlink_pernet_pre_exit+0x1ca/0x350 net/core/devlink.c:11543 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x59c/0xb60 net/core/net_namespace.c:587 Memory state around the buggy address: ffff88801a33bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801a33bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801a33c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801a33c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88801a33c100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================