================================================================== 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 52 at addr ffff88811ba5bb97 by task syz.5.23/540 CPU: 0 PID: 540 Comm: syz.5.23 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_getdents fs/readdir.c:286 [inline] __se_sys_getdents+0xf2/0x250 fs/readdir.c:271 __x64_sys_getdents+0x7b/0x90 fs/readdir.c:271 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f0e6ef0aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0e6ed6f028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f0e6f185fa0 RCX: 00007f0e6ef0aeb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f0e6ef78c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0e6f186038 R14: 00007f0e6f185fa0 R15: 00007ffe314a4298 Allocated by task 0: (stack is not available) Freed by task 502: 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] pskb_expand_head+0x367/0x1110 net/core/skbuff.c:1686 netlink_trim+0x193/0x230 net/netlink/af_netlink.c:1295 netlink_broadcast_filtered+0x78/0x1270 net/netlink/af_netlink.c:1507 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 __dev_notify_flags+0xdc/0x560 net/core/dev.c:8568 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8610 do_setlink+0xc06/0x3e10 net/core/rtnetlink.c:2732 __rtnl_newlink net/core/rtnetlink.c:3410 [inline] rtnl_newlink+0x1534/0x18f0 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0xa31/0xcc0 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x467/0x620 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+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811ba5a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2967 bytes to the right of 4096-byte region [ffff88811ba5a000, ffff88811ba5b000) The buggy address belongs to the page: page:ffffea00046e9600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ba58 head:ffffea00046e9600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042c00 raw: 0000000000000000 0000000000040004 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 498, ts 48505209094, free_ts 48458213125 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] 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 __dev_notify_flags+0xdc/0x560 net/core/dev.c:8568 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8610 do_setlink+0xc06/0x3e10 net/core/rtnetlink.c:2732 __rtnl_newlink net/core/rtnetlink.c:3410 [inline] rtnl_newlink+0x1534/0x18f0 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0xa31/0xcc0 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 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+0x29/0x40 mm/slub.c:1920 __slab_free+0x313/0x3a0 mm/slub.c:3136 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 getname_flags+0xb9/0x500 fs/namei.c:141 getname+0x19/0x20 fs/namei.c:212 do_sys_openat2+0xde/0x750 fs/open.c:1213 do_sys_open fs/open.c:1235 [inline] __do_sys_openat fs/open.c:1251 [inline] __se_sys_openat fs/open.c:1246 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1246 Memory state around the buggy address: ffff88811ba5ba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811ba5bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811ba5bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811ba5bc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811ba5bc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop5): ext4_inlinedir_to_tree:1457: inode #12: block 7: comm syz.5.23: path /1/file1/file0: bad entry in directory: rec_len % 4 != 0 - offset=35110, inode=3517778242, rec_len=35106, size=112 fake=0