================================================================== BUG: KASAN: use-after-free in dev_put include/linux/netdevice.h:3982 [inline] BUG: KASAN: use-after-free in netdevice_event_work_handler+0x15b/0x1b0 drivers/infiniband/core/roce_gid_mgmt.c:630 Read of size 8 at addr ffff888064d0a568 by task kworker/u4:0/8 CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: gid-cache-wq netdevice_event_work_handler Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 dev_put include/linux/netdevice.h:3982 [inline] netdevice_event_work_handler+0x15b/0x1b0 drivers/infiniband/core/roce_gid_mgmt.c:630 process_one_work+0x868/0x15c0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 20240: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:575 kvmalloc include/linux/mm.h:773 [inline] kvzalloc include/linux/mm.h:781 [inline] alloc_netdev_mqs+0x97/0xe80 net/core/dev.c:10522 __ip_tunnel_create+0x201/0x5d0 net/ipv4/ip_tunnel.c:254 ip_tunnel_init_net+0x204/0x5c0 net/ipv4/ip_tunnel.c:1063 ops_init+0xaf/0x4a0 net/core/net_namespace.c:152 setup_net+0x2de/0x850 net/core/net_namespace.c:342 copy_net_ns+0x376/0x7b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x230 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2957 __do_sys_unshare kernel/fork.c:3025 [inline] __se_sys_unshare kernel/fork.c:3023 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3023 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 20240: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:352 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3140 [inline] kfree+0xdb/0x400 mm/slub.c:4122 kvfree+0x42/0x50 mm/util.c:604 device_release+0x9f/0x240 drivers/base/core.c:1962 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3190 free_netdev+0x40d/0x540 net/core/dev.c:10642 __ip_tunnel_create+0x49b/0x5d0 net/ipv4/ip_tunnel.c:274 ip_tunnel_init_net+0x204/0x5c0 net/ipv4/ip_tunnel.c:1063 ops_init+0xaf/0x4a0 net/core/net_namespace.c:152 setup_net+0x2de/0x850 net/core/net_namespace.c:342 copy_net_ns+0x376/0x7b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x230 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2957 __do_sys_unshare kernel/fork.c:3025 [inline] __se_sys_unshare kernel/fork.c:3023 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3023 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888064d0a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1384 bytes inside of 4096-byte region [ffff888064d0a000, ffff888064d0b000) The buggy address belongs to the page: page:00000000e77dc203 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64d08 head:00000000e77dc203 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011042140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888064d0a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064d0a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888064d0a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064d0a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064d0a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================