================================================================== 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 ffff88807df76c90 by task syz-executor.0/26000 CPU: 0 PID: 26000 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-04667-g9d1a26e7e43c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __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_master_upper_dev_link+0xa0/0xd0 net/core/dev.c:7829 batadv_hardif_enable_interface+0x28a/0xd20 net/batman-adv/hard-interface.c:734 batadv_softif_slave_add+0xee/0x130 net/batman-adv/soft-interface.c:844 do_set_master+0x1b5/0x220 net/core/rtnetlink.c:2704 do_setlink+0xa4a/0x4090 net/core/rtnetlink.c:2903 __rtnl_newlink+0xc28/0x1940 net/core/rtnetlink.c:3701 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: 0033:0x7f6fa2e7cda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6fa3b550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6fa2fabf80 RCX: 00007f6fa2e7cda9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007f6fa2ec947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6fa2fabf80 R15: 00007ffe486ce018 Allocated by task 23624: 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 ffff88807df76000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3216 bytes inside of allocated 3223-byte region [ffff88807df76000, ffff88807df76c97) The buggy address belongs to the physical page: page:ffffea0001f7dc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7df70 head:ffffea0001f7dc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88807e180981 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff88801304f500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88807e180981 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 4517, tgid 4517 (udevd), ts 36900247250, free_ts 36868946235 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 4524 tgid 4524 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] kmem_cache_alloc+0x136/0x320 mm/slub.c:3867 getname_flags.part.0+0x50/0x4e0 fs/namei.c:140 getname_flags+0x9c/0xf0 include/linux/audit.h:322 vfs_fstatat+0x9a/0x140 fs/stat.c:303 __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: ffff88807df76b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807df76c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807df76c80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807df76d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807df76d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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