================================================================== BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in l2cap_sock_setsockopt+0x21f4/0x2930 net/bluetooth/l2cap_sock.c:978 Read of size 4 at addr ffff8880256b54e3 by task syz-executor.2/9467 CPU: 1 PID: 9467 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] copy_from_sockptr include/linux/sockptr.h:55 [inline] l2cap_sock_setsockopt+0x21f4/0x2930 net/bluetooth/l2cap_sock.c:978 do_sock_setsockopt+0x3b1/0x720 net/socket.c:2311 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fab9a87de69 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:00007fab9b5000c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fab9a9abf80 RCX: 00007fab9a87de69 RDX: 0000000000000008 RSI: 0000000000000112 RDI: 0000000000000007 RBP: 00007fab9a8ca47a R08: 0000000000000002 R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fab9a9abf80 R15: 00007fffb5390368 Allocated by task 9467: 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:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3966 [inline] __kmalloc+0x233/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] __cgroup_bpf_run_filter_setsockopt+0xd2f/0x1040 kernel/bpf/cgroup.c:1869 do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff8880256b54e0 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 1 bytes to the right of allocated 2-byte region [ffff8880256b54e0, ffff8880256b54e2) The buggy address belongs to the physical page: page:ffffea000095ad40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x256b5 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c41280 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 8685, tgid 8684 (syz-executor.4), ts 202411064968, free_ts 202408515095 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __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:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x2e5/0x4a0 mm/slub.c:3979 kmalloc_array include/linux/slab.h:665 [inline] kcalloc include/linux/slab.h:696 [inline] nsim_fib6_event_init drivers/net/netdevsim/fib.c:810 [inline] nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline] nsim_fib_event_nb+0x287/0x10b0 drivers/net/netdevsim/fib.c:1043 call_fib_notifier+0x44/0x70 net/core/fib_notifier.c:24 call_fib6_entry_notifier net/ipv6/ip6_fib.c:375 [inline] fib6_rt_dump net/ipv6/ip6_fib.c:454 [inline] fib6_node_dump+0x2d3/0x380 net/ipv6/ip6_fib.c:464 fib6_walk_continue+0x65a/0x8f0 net/ipv6/ip6_fib.c:2123 fib6_walk+0x168/0x2b0 net/ipv6/ip6_fib.c:2171 fib6_table_dump net/ipv6/ip6_fib.c:476 [inline] fib6_tables_dump+0x21a/0x310 net/ipv6/ip6_fib.c:505 fib_net_dump net/core/fib_notifier.c:71 [inline] register_fib_notifier+0x184/0x370 net/core/fib_notifier.c:109 nsim_fib_create+0x902/0xa70 drivers/net/netdevsim/fib.c:1595 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1480 [inline] nsim_dev_reload_up+0x3d1/0x8e0 drivers/net/netdevsim/dev.c:985 page last free pid 8706 tgid 8706 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+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 vfree+0x186/0x2e0 mm/vmalloc.c:2914 vb2_vmalloc_put+0x68/0xb0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:68 __vb2_buf_mem_free+0xfc/0x2a0 drivers/media/common/videobuf2/videobuf2-core.c:276 __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:536 [inline] __vb2_queue_free+0x464/0xe10 drivers/media/common/videobuf2/videobuf2-core.c:566 vb2_core_queue_release+0x63/0xc0 drivers/media/common/videobuf2/videobuf2-core.c:2555 v4l2_m2m_ctx_release+0x2a/0x40 drivers/media/v4l2-core/v4l2-mem2mem.c:1271 vicodec_release+0x97/0x110 drivers/media/test-drivers/vicodec/vicodec-core.c:1940 v4l2_release+0x1fa/0x3b0 drivers/media/v4l2-core/v4l2-dev.c:456 __fput+0x42b/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff8880256b5380: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff8880256b5400: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc >ffff8880256b5480: fa fc fc fc fa fc fc fc fa fc fc fc 02 fc fc fc ^ ffff8880256b5500: fa fc fc fc fa fc fc fc 00 fc fc fc fa fc fc fc ffff8880256b5580: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc 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