syzbot

==================================================================
BUG: KASAN: slab-out-of-bounds in dsa_user_to_port net/dsa/user.h:58 [inline]
BUG: KASAN: slab-out-of-bounds in dsa_user_changeupper+0x61a/0x6e0 net/dsa/user.c:2809
Read of size 8 at addr ffff8880230dec90 by task syz-executor368/5085

CPU: 0 PID: 5085 Comm: syz-executor368 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:488
 kasan_report+0xda/0x110 mm/kasan/report.c:601
 dsa_user_to_port net/dsa/user.h:58 [inline]
 dsa_user_changeupper+0x61a/0x6e0 net/dsa/user.c:2809
 dsa_user_netdevice_event+0xd04/0x3480 net/dsa/user.c:3345
 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x130 net/core/dev.c:1966
 __netdev_upper_dev_link+0x439/0x850 net/core/dev.c:7759
 netdev_upper_dev_link+0x92/0xc0 net/core/dev.c:7800
 macvlan_common_newlink+0x111e/0x1a10 drivers/net/macvlan.c:1539
 rtnl_newlink_create net/core/rtnetlink.c:3515 [inline]
 __rtnl_newlink+0x118a/0x1940 net/core/rtnetlink.c:3735
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3748
 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f6a3c26cb69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffc49e72b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f6a3c26cb69
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffc49e7310
R13: 0000000000013467 R14: 00007fffc49e72dc R15: 0000000000000003
 </TASK>

Allocated by task 5062:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3981 [inline]
 __kmalloc_node+0x21b/0x460 mm/slub.c:3988
 kmalloc_node include/linux/slab.h:610 [inline]
 kvmalloc_node+0x99/0x1a0 mm/util.c:617
 kvmalloc include/linux/slab.h:728 [inline]
 kvzalloc include/linux/slab.h:736 [inline]
 alloc_netdev_mqs+0xb3/0x12a0 net/core/dev.c:10826
 rtnl_create_link+0xc82/0xfb0 net/core/rtnetlink.c:3379
 rtnl_newlink_create net/core/rtnetlink.c:3505 [inline]
 __rtnl_newlink+0x10a1/0x1940 net/core/rtnetlink.c:3735
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3748
 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x225/0x310 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff8880230de000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3216 bytes inside of
 allocated 3223-byte region [ffff8880230de000, ffff8880230dec97)

The buggy address belongs to the physical page:
page:ffffea00008c3600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x230d8
head:ffffea00008c3600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff88801304f500 0000000000000000 0000000000000001
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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4525, tgid 4525 (udevd), ts 35662326073, free_ts 35648097089
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2190 [inline]
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2407
 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc_node+0x35d/0x460 mm/slub.c:3988
 kmalloc_node include/linux/slab.h:610 [inline]
 kvmalloc_node+0x99/0x1a0 mm/util.c:617
 kvmalloc include/linux/slab.h:728 [inline]
 seq_buf_alloc fs/seq_file.c:38 [inline]
 seq_read_iter+0x80b/0x1280 fs/seq_file.c:210
 kernfs_fop_read_iter+0x410/0x580 fs/kernfs/file.c:279
 call_read_iter include/linux/fs.h:2079 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x4d4/0x8f0 fs/read_write.c:476
 ksys_read+0x12f/0x250 fs/read_write.c:619
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free pid 4528 tgid 4528 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2346
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
 __put_partials+0x14c/0x160 mm/slub.c:2922
 qlink_free mm/kasan/quarantine.c:160 [inline]
 qlist_free_all+0x58/0x150 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:324
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc+0x1bd/0x440 mm/slub.c:3994
 kmalloc include/linux/slab.h:594 [inline]
 tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x26f/0x450 security/tomoyo/file.c:822
 security_inode_getattr+0xf1/0x150 security/security.c:2237
 vfs_getattr fs/stat.c:173 [inline]
 vfs_fstat+0x4f/0xc0 fs/stat.c:198
 vfs_fstatat+0x130/0x140 fs/stat.c:300
 __do_sys_newfstatat+0x98/0x110 fs/stat.c:468
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff8880230deb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880230dec00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880230dec80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff8880230ded00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880230ded80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================