================================================================== 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+0x56c/0xf40 fs/ext4/inline.c:1409 Read of size 68 at addr ffff88811067cec9 by task syz-executor.4/334 CPU: 1 PID: 334 Comm: syz-executor.4 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 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+0x56c/0xf40 fs/ext4/inline.c:1409 ext4_htree_fill_tree+0x4c5/0x10d0 fs/ext4/namei.c:1186 ext4_dx_readdir fs/ext4/dir.c:601 [inline] ext4_readdir+0x2b45/0x39b0 fs/ext4/dir.c:145 iterate_dir+0x260/0x570 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xe5/0x240 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: 0033:0x7fe77a473363 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 62 8b fa 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 b0 ff ff ff f7 d8 RSP: 002b:00007ffc8e1239f8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055557f605890 RCX: 00007fe77a473363 RDX: 0000000000008000 RSI: 000055557f605890 RDI: 0000000000000006 RBP: 000055557f605864 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb0 R13: 0000000000000016 R14: 000055557f605860 R15: 0000000000000008 Allocated by task 0: (stack is not available) Freed by task 25: 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+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:6162 ipv6_ifa_notify net/ipv6/addrconf.c:6202 [inline] addrconf_dad_completed+0x183/0xe80 net/ipv6/addrconf.c:4248 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 ffff88811067c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 713 bytes to the right of 1024-byte region [ffff88811067c800, ffff88811067cc00) The buggy address belongs to the page: page:ffffea0004419e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110678 head:ffffea0004419e00 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 95, ts 4981314490, 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: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+0x1ef/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] netlink_alloc_large_skb net/netlink/af_netlink.c:1178 [inline] netlink_sendmsg+0x5f6/0xb30 net/netlink/af_netlink.c:1889 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page_owner free stack trace missing Memory state around the buggy address: ffff88811067cd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811067ce00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811067ce80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811067cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811067cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop4): ext4_inlinedir_to_tree:1447: inode #12: block 7: comm syz-executor.4: path /root/syzkaller-testdir564181952/syzkaller.NZ3rst/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 loop4): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.4: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs error (device loop4): ext4_inlinedir_to_tree:1447: inode #12: block 7: comm syz-executor.4: path /root/syzkaller-testdir564181952/syzkaller.NZ3rst/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 loop4): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.4: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs error (device loop4): ext4_inlinedir_to_tree:1447: inode #12: block 7: comm syz-executor.4: path /root/syzkaller-testdir564181952/syzkaller.NZ3rst/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 loop4): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.4: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs error (device loop4): ext4_inlinedir_to_tree:1447: inode #12: block 7: comm syz-executor.4: path /root/syzkaller-testdir564181952/syzkaller.NZ3rst/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 loop4): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.4: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs error (device loop4): ext4_inlinedir_to_tree:1447: inode #12: block 7: comm syz-executor.4: path /root/syzkaller-testdir564181952/syzkaller.NZ3rst/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 loop4): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.4: bad entry in directory: directory entry overrun - offset=4, inode=2538880996, rec_len=34812, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1865: bad inline directory (dir #12) - inode 2538880996, rec_len 34812, name_len 234inline size 60