syzbot

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BUG: KASAN: slab-use-after-free in rose_link_device_down+0x7a/0xb0 net/rose/rose_route.c:-1
Read of size 8 at addr ffff88805cab3800 by task syz.4.2671/14280

CPU: 1 UID: 0 PID: 14280 Comm: syz.4.2671 Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 rose_link_device_down+0x7a/0xb0 net/rose/rose_route.c:-1
 rose_device_event+0x5fe/0x6a0 net/rose/af_rose.c:247
 notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
 call_netdevice_notifiers net/core/dev.c:2228 [inline]
 dev_close_many+0x33e/0x4c0 net/core/dev.c:1731
 netif_close+0x1c2/0x2d0 net/core/dev.c:1744
 dev_close+0x137/0x280 net/core/dev_api.c:219
 bpq_device_event+0x36a/0x620 drivers/net/hamradio/bpqether.c:528
 notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
 call_netdevice_notifiers net/core/dev.c:2228 [inline]
 dev_close_many+0x33e/0x4c0 net/core/dev.c:1731
 netif_close+0x1c2/0x2d0 net/core/dev.c:1744
 dev_close+0x137/0x280 net/core/dev_api.c:219
 bond_setup_by_slave+0x64/0x420 drivers/net/bonding/bond_main.c:1627
 bond_enslave+0x7fb/0x38d0 drivers/net/bonding/bond_main.c:2039
 bond_do_ioctl+0x7c9/0xc00 drivers/net/bonding/bond_main.c:4684
 dev_siocbond net/core/dev_ioctl.c:502 [inline]
 dev_ifsioc+0x97c/0x1010 net/core/dev_ioctl.c:650
 dev_ioctl+0x80f/0x1260 net/core/dev_ioctl.c:821
 sock_do_ioctl+0x22f/0x400 net/socket.c:1204
 sock_ioctl+0x644/0x900 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf3/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde0958e169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde0a425038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fde097b5fa0 RCX: 00007fde0958e169
RDX: 0000200000000180 RSI: 0000000000008990 RDI: 0000000000000007
RBP: 00007fde09610a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fde097b5fa0 R15: 00007ffe60f20de8
 </TASK>

Allocated by task 14280:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4372
 kmalloc_noprof include/linux/slab.h:905 [inline]
 rose_add_node+0x209/0xdb0 net/rose/rose_route.c:85
 rose_rt_ioctl+0xac2/0xf80 net/rose/rose_route.c:747
 rose_ioctl+0x3ca/0x9e0 net/rose/af_rose.c:1380
 sock_do_ioctl+0x154/0x400 net/socket.c:1190
 sock_ioctl+0x644/0x900 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf3/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 14285:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2398 [inline]
 slab_free mm/slub.c:4656 [inline]
 kfree+0x198/0x430 mm/slub.c:4855
 rose_clear_routes net/rose/rose_route.c:578 [inline]
 rose_rt_ioctl+0x356/0xf80 net/rose/rose_route.c:759
 rose_ioctl+0x3ca/0x9e0 net/rose/af_rose.c:1380
 sock_do_ioctl+0x154/0x400 net/socket.c:1190
 sock_ioctl+0x644/0x900 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf3/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88805cab3800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 freed 512-byte region [ffff88805cab3800, ffff88805cab3a00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5cab0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000172ac01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5844, tgid 5844 (syz-executor), ts 91662223925, free_ts 29431073190
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x360a/0x37a0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4970
 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2468 [inline]
 allocate_slab+0x8f/0x3b0 mm/slub.c:2632
 new_slab mm/slub.c:2686 [inline]
 ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872
 __slab_alloc+0x58/0xa0 mm/slub.c:3962
 __slab_alloc_node mm/slub.c:4037 [inline]
 slab_alloc_node mm/slub.c:4198 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_noprof+0x2ea/0x4d0 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:909 [inline]
 switchdev_deferred_enqueue+0x4d/0x2a0 net/switchdev/switchdev.c:117
 br_set_state+0x2cd/0x7b0 net/bridge/br_stp.c:52
 br_init_port+0xa0/0x210 net/bridge/br_stp_if.c:39
 new_nbp+0x30c/0x440 net/bridge/br_if.c:442
 br_add_if+0x28d/0xef0 net/bridge/br_if.c:599
 do_set_master+0x57b/0x730 net/core/rtnetlink.c:2946
 do_setlink+0xf76/0x4390 net/core/rtnetlink.c:3159
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x17e2/0x1fe0 net/core/rtnetlink.c:4065
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 __free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2725
 __free_pages mm/page_alloc.c:5080 [inline]
 free_contig_range+0x154/0x430 mm/page_alloc.c:6936
 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017
 debug_vm_pgtable+0x555/0x590 mm/debug_vm_pgtable.c:1397
 do_one_initcall+0x24c/0x940 init/main.c:1257
 do_initcall_level+0x157/0x210 init/main.c:1319
 do_initcalls+0x71/0xd0 init/main.c:1335
 kernel_init_freeable+0x432/0x5d0 init/main.c:1567
 kernel_init+0x1d/0x2b0 init/main.c:1457
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88805cab3700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805cab3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805cab3800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88805cab3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805cab3900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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