==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_read_inline_data fs/ext4/inline.c:209 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_inlinedir_to_tree+0x5f6/0xfd0 fs/ext4/inline.c:1419
Read of size 68 at addr ffff8881102e9ec9 by task syz-executor.1/335

CPU: 0 PID: 335 Comm: syz-executor.1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 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
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 ext4_read_inline_data fs/ext4/inline.c:209 [inline]
 ext4_inlinedir_to_tree+0x5f6/0xfd0 fs/ext4/inline.c:1419
 ext4_htree_fill_tree+0x508/0x1160 fs/ext4/namei.c:1186
 ext4_dx_readdir fs/ext4/dir.c:601 [inline]
 ext4_readdir+0x2c49/0x3ab0 fs/ext4/dir.c:145
 iterate_dir+0x260/0x570 fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0xf2/0x250 fs/readdir.c:354
 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f77e29cdcf3
Code: 48 0f 45 c2 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 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 d0 ff ff ff f7 d8
RSP: 002b:00007ffeee43e668 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055556ef178c0 RCX: 00007f77e29cdcf3
RDX: 0000000000008000 RSI: 000055556ef178f0 RDI: 0000000000000006
RBP: 000055556ef178f0 R08: 00007f77e2aba640 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 000055556ef178c4
R13: ffffffffffffffd0 R14: 0000000000000016 R15: 0000000000000008

Allocated by task 0:
(stack is not available)

Freed by task 9:
 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:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kfree+0xc0/0x270 mm/slub.c:4196
 skb_free_head net/core/skbuff.c:606 [inline]
 skb_release_data+0x532/0x670 net/core/skbuff.c:626
 skb_release_all net/core/skbuff.c:680 [inline]
 __kfree_skb net/core/skbuff.c:694 [inline]
 consume_skb+0xab/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 net/core/rtnetlink.c:737 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:3868 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3883 [inline]
 rtmsg_ifinfo+0xea/0x130 net/core/rtnetlink.c:3889
 netdev_state_change+0x190/0x230 net/core/dev.c:1486
 linkwatch_do_dev+0x102/0x140 net/core/link_watch.c:167
 __linkwatch_run_queue+0x4b1/0x7c0 net/core/link_watch.c:213
 linkwatch_event+0x4c/0x60 net/core/link_watch.c:252
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 process_scheduled_works kernel/workqueue.c:2363 [inline]
 worker_thread+0xcf8/0x13c0 kernel/workqueue.c:2449
 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 ffff8881102e9000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1737 bytes to the right of
 2048-byte region [ffff8881102e9000, ffff8881102e9800)
The buggy address belongs to the page:
page:ffffea000440ba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1102e8
head:ffffea000440ba00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042d80
raw: 0000000000000000 0000000000080008 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 9, ts 40035593838, free_ts 40019852935
 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+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5370
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 __kmalloc_track_caller+0x1ec/0x320 mm/slub.c:4541
 __kmalloc_reserve net/core/skbuff.c:144 [inline]
 __alloc_skb+0xdc/0x520 net/core/skbuff.c:212
 alloc_skb include/linux/skbuff.h:1126 [inline]
 alloc_skb_with_frags+0xa2/0x560 net/core/skbuff.c:5993
 sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2393
 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2410
 mld_newpack+0x1ad/0x990 net/ipv6/mcast.c:1604
 add_grhead+0x5e/0x290 net/ipv6/mcast.c:1707
 add_grec+0xd43/0x1100 net/ipv6/mcast.c:1838
 mld_send_cr net/ipv6/mcast.c:1964 [inline]
 mld_ifc_timer_expire+0x770/0xc50 net/ipv6/mcast.c:2471
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450
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+0x80b/0x830 mm/page_alloc.c:1629
 free_the_page mm/page_alloc.c:5431 [inline]
 __free_pages+0xd8/0x3b0 mm/page_alloc.c:5440
 __free_slab+0xcf/0x190 mm/slub.c:1899
 free_slab mm/slub.c:1914 [inline]
 discard_slab mm/slub.c:1920 [inline]
 unfreeze_partials+0x15f/0x190 mm/slub.c:2415
 put_cpu_partial+0xc1/0x180 mm/slub.c:2451
 __slab_free+0x2c9/0x3a0 mm/slub.c:3100
 do_slab_free mm/slub.c:3196 [inline]
 ___cache_free+0x10e/0x130 mm/slub.c:3215
 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:440
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965
 kmem_cache_alloc_node include/linux/slab.h:426 [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]
 rtmsg_ifinfo_build_skb+0x7c/0x180 net/core/rtnetlink.c:3844
 rtmsg_ifinfo_event net/core/rtnetlink.c:3880 [inline]
 rtmsg_ifinfo+0x7a/0x130 net/core/rtnetlink.c:3889

Memory state around the buggy address:
 ffff8881102e9d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881102e9e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881102e9e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                              ^
 ffff8881102e9f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881102e9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs error (device loop1): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz-executor.1: path /root/syzkaller-testdir869888186/syzkaller.Y6QhVr/0/file0/file0: bad entry in directory: directory entry overrun - offset=34816, inode=2538880996, rec_len=34812, size=128 fake=0
EXT4-fs error (device loop1): empty_inline_dir:1868: inode #12: block 7: comm syz-executor.1: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs error (device loop1): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz-executor.1: path /root/syzkaller-testdir869888186/syzkaller.Y6QhVr/0/file0/file0: bad entry in directory: directory entry overrun - offset=34816, inode=2538880996, rec_len=34812, size=128 fake=0
EXT4-fs error (device loop1): empty_inline_dir:1868: inode #12: block 7: comm syz-executor.1: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs error (device loop1): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz-executor.1: path /root/syzkaller-testdir869888186/syzkaller.Y6QhVr/0/file0/file0: bad entry in directory: directory entry overrun - offset=34816, inode=2538880996, rec_len=34812, size=128 fake=0
EXT4-fs error (device loop1): empty_inline_dir:1868: inode #12: block 7: comm syz-executor.1: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs error (device loop1): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz-executor.1: path /root/syzkaller-testdir869888186/syzkaller.Y6QhVr/0/file0/file0: bad entry in directory: directory entry overrun - offset=34816, inode=2538880996, rec_len=34812, size=128 fake=0
EXT4-fs error (device loop1): empty_inline_dir:1868: inode #12: block 7: comm syz-executor.1: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs error (device loop1): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz-executor.1: path /root/syzkaller-testdir869888186/syzkaller.Y6QhVr/0/file0/file0: bad entry in directory: directory entry overrun - offset=34816, inode=2538880996, rec_len=34812, size=128 fake=0
EXT4-fs error (device loop1): empty_inline_dir:1868: inode #12: block 7: comm syz-executor.1: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60
EXT4-fs warning (device loop1): empty_inline_dir:1875: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60