BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xbe3/0xbf0 fs/ext4/xattr.c:2909
Read of size 4 at addr ffff88810e7fd000 by task syz-executor/484

CPU: 1 PID: 484 Comm: syz-executor Not tainted 5.10.240-syzkaller-1008073-gad9a98ef27a4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xbe3/0xbf0 fs/ext4/xattr.c:2909
 ext4_evict_inode+0x106f/0x16e0 fs/ext4/inode.c:300
 evict+0x478/0x910 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 d_delete_notify include/linux/fsnotify.h:267 [inline]
 vfs_rmdir+0x2bd/0x3e0 fs/namei.c:3865
 do_rmdir+0x218/0x620 fs/namei.c:3912
 __do_sys_unlinkat fs/namei.c:4076 [inline]
 __se_sys_unlinkat fs/namei.c:4070 [inline]
 __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4070
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9cadb18887
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc394d6118 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f9cadb18887
RDX: 0000000000000200 RSI: 00007ffc394d72c0 RDI: 00000000ffffff9c
RBP: 00007f9cadb756c6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffc394d72c0
R13: 00007f9cadb756c6 R14: 000000000000c241 R15: 0000000000000007

Allocated by task 390:
 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_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960
 kmem_cache_alloc_node include/linux/slab.h:423 [inline]
 __alloc_skb+0x9e/0x520 net/core/skbuff.c:200
 alloc_skb include/linux/skbuff.h:1126 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 inet6_rt_notify+0x287/0x470 net/ipv6/route.c:6055
 fib6_add_rt2node net/ipv6/ip6_fib.c:1253 [inline]
 fib6_add+0x214b/0x3bf0 net/ipv6/ip6_fib.c:1482
 __ip6_ins_rt net/ipv6/route.c:1303 [inline]
 ip6_ins_rt+0xc5/0x110 net/ipv6/route.c:1313
 __ipv6_ifa_notify+0x4bf/0xdb0 net/ipv6/addrconf.c:6158
 ipv6_ifa_notify net/ipv6/addrconf.c:6198 [inline]
 addrconf_dad_completed+0x183/0xe80 net/ipv6/addrconf.c:4244
 addrconf_dad_work+0xc18/0x1410 net/ipv6/addrconf.c:-1
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 390:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 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+0xc5/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3219
 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1
 __kfree_skb net/core/skbuff.c:695 [inline]
 consume_skb+0xb3/0x1f0 net/core/skbuff.c:851
 netlink_broadcast_filtered+0x117d/0x1270 net/netlink/af_netlink.c:1530
 netlink_broadcast net/netlink/af_netlink.c:1552 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0xed/0x1b0 net/netlink/af_netlink.c:2546
 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:737
 inet6_rt_notify+0x365/0x470 net/ipv6/route.c:6067
 fib6_add_rt2node net/ipv6/ip6_fib.c:1253 [inline]
 fib6_add+0x214b/0x3bf0 net/ipv6/ip6_fib.c:1482
 __ip6_ins_rt net/ipv6/route.c:1303 [inline]
 ip6_ins_rt+0xc5/0x110 net/ipv6/route.c:1313
 __ipv6_ifa_notify+0x4bf/0xdb0 net/ipv6/addrconf.c:6158
 ipv6_ifa_notify net/ipv6/addrconf.c:6198 [inline]
 addrconf_dad_completed+0x183/0xe80 net/ipv6/addrconf.c:4244
 addrconf_dad_work+0xc18/0x1410 net/ipv6/addrconf.c:-1
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff88810e7fd000
 which belongs to the cache skbuff_head_cache of size 248
The buggy address is located 0 bytes inside of
 248-byte region [ffff88810e7fd000, ffff88810e7fd0f8)
The buggy address belongs to the page:
page:ffffea000439ff40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e7fd
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea00043de3c0 0000000400000004 ffff888107d94600
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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 96, ts 4460415431, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x2a6/0x450 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]
 kmem_cache_alloc+0x1af/0x2e0 mm/slub.c:2960
 skb_clone+0x1e9/0x380 net/core/skbuff.c:1467
 do_one_broadcast net/netlink/af_netlink.c:1453 [inline]
 netlink_broadcast_filtered+0x695/0x1270 net/netlink/af_netlink.c:1528
 netlink_broadcast+0x3a/0x50 net/netlink/af_netlink.c:1552
 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
 kobject_uevent_net_broadcast+0x3bd/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52e/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x520/0xaf0 lib/kobject_uevent.c:208
 uevent_store+0x4b/0x70 drivers/base/bus.c:587
 drv_attr_store+0x79/0xa0 drivers/base/bus.c:77
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810e7fcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810e7fcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88810e7fd000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88810e7fd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
 ffff88810e7fd100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
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