================================================================== 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_prechangeupper+0x3a/0x240 net/dsa/user.c:2868 Read of size 8 at addr ffff8880137b4c90 by task syz-executor.2/6633 CPU: 0 PID: 6633 Comm: syz-executor.2 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: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x163/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x170 mm/kasan/report.c:601 dsa_user_to_port net/dsa/user.h:58 [inline] dsa_user_prechangeupper+0x3a/0x240 net/dsa/user.c:2868 dsa_user_netdevice_event+0x1a37/0x2ab0 net/dsa/user.c:3332 notifier_call_chain+0x18c/0x3b0 kernel/notifier.c:93 __netdev_upper_dev_link+0x39d/0x670 net/core/dev.c:7748 netdev_upper_dev_link+0x9e/0xe0 net/core/dev.c:7800 register_vlan_dev+0x3af/0x810 net/8021q/vlan.c:183 register_vlan_device+0x378/0x4a0 net/8021q/vlan.c:277 vlan_ioctl_handler+0x2b9/0x9d0 net/8021q/vlan.c:621 sock_ioctl+0x66b/0x8c0 net/socket.c:1305 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f268267cda9 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:00007f26833840c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f26827ac050 RCX: 00007f268267cda9 RDX: 0000000020006480 RSI: 0000000000008982 RDI: 000000000000000a RBP: 00007f26826c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f26827ac050 R15: 00007ffe753e4758 Allocated by task 1: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x70 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node+0x24e/0x4e0 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x180 mm/util.c:617 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] alloc_netdev_mqs+0x9d/0xf80 net/core/dev.c:10826 dummy_init_one+0x2f/0xb0 drivers/net/dummy.c:158 dummy_init_module+0x64/0x100 drivers/net/dummy.c:184 do_one_initcall+0x234/0x810 init/main.c:1236 do_initcall_level+0x157/0x210 init/main.c:1298 do_initcalls+0x3f/0x80 init/main.c:1314 kernel_init_freeable+0x429/0x5c0 init/main.c:1551 kernel_init+0x1d/0x2a0 init/main.c:1441 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff8880137b4000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3216 bytes inside of allocated 3223-byte region [ffff8880137b4000, ffff8880137b4c97) The buggy address belongs to the physical page: page:ffffea00004dec00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x137b0 head:ffffea00004dec00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c4f500 dead000000000122 0000000000000000 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 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3767194420, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 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+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13d0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __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+0x2d2/0x4e0 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x180 mm/util.c:617 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] alloc_netdev_mqs+0x9d/0xf80 net/core/dev.c:10826 loopback_net_init+0x38/0x150 drivers/net/loopback.c:214 ops_init+0x351/0x600 net/core/net_namespace.c:136 __register_pernet_operations net/core/net_namespace.c:1214 [inline] register_pernet_operations+0x2cb/0x660 net/core/net_namespace.c:1283 register_pernet_device+0x33/0x80 net/core/net_namespace.c:1370 net_dev_init+0xa7e/0xb40 net/core/dev.c:11745 do_one_initcall+0x234/0x810 init/main.c:1236 do_initcall_level+0x157/0x210 init/main.c:1298 page_owner free stack trace missing Memory state around the buggy address: ffff8880137b4b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880137b4c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880137b4c80: 00 00 07 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880137b4d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880137b4d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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