================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:43 [inline] BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:254 [inline] BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:951 [inline] BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x209/0x4d0 net/rds/cong.c:229 Read of size 4 at addr ffff88805c414184 by task syz-executor.5/9932 CPU: 0 PID: 9932 Comm: syz-executor.5 Not tainted 5.1.0-rc1+ #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:102 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] refcount_read include/linux/refcount.h:43 [inline] check_net include/net/net_namespace.h:254 [inline] rds_destroy_pending net/rds/rds.h:951 [inline] rds_cong_queue_updates+0x209/0x4d0 net/rds/cong.c:229 rds_recv_rcvbuf_delta.part.0+0x34f/0x3f0 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:379 [inline] rds_recv_incoming+0x789/0x11f0 net/rds/recv.c:379 rds_loop_xmit+0xf3/0x2a0 net/rds/loop.c:96 rds_send_xmit+0x1113/0x2560 net/rds/send.c:355 rds_sendmsg+0x3017/0x3550 net/rds/send.c:1369 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 ___sys_sendmsg+0x806/0x930 net/socket.c:2137 __sys_sendmsg+0x105/0x1d0 net/socket.c:2175 __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg net/socket.c:2182 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2182 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f439a677c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f439a6786d4 R13: 00000000004c5873 R14: 00000000004d97a8 R15: 00000000ffffffff Allocated by task 9175: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 __do_kmalloc_node mm/slab.c:3686 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3700 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1058 [inline] nlmsg_new include/net/netlink.h:658 [inline] rtmsg_ifinfo_build_skb+0x74/0x1a0 net/core/rtnetlink.c:3448 rtmsg_ifinfo_event.part.0+0x43/0xe0 net/core/rtnetlink.c:3484 rtmsg_ifinfo_event net/core/rtnetlink.c:3495 [inline] rtmsg_ifinfo+0x8d/0xa0 net/core/rtnetlink.c:3493 register_netdevice+0xb45/0xff0 net/core/dev.c:8752 register_netdev+0x30/0x50 net/core/dev.c:8829 sit_init_net+0x380/0xa60 net/ipv6/sit.c:1863 ops_init+0xb6/0x410 net/core/net_namespace.c:129 setup_net+0x2c5/0x730 net/core/net_namespace.c:314 copy_net_ns+0x1d9/0x340 net/core/net_namespace.c:437 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2549 __do_sys_unshare kernel/fork.c:2617 [inline] __se_sys_unshare kernel/fork.c:2615 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2615 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9175: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 skb_free_head+0x93/0xb0 net/core/skbuff.c:557 pskb_expand_head+0x2ba/0xdd0 net/core/skbuff.c:1502 netlink_trim+0x218/0x270 net/netlink/af_netlink.c:1292 netlink_broadcast_filtered+0x64/0xb20 net/netlink/af_netlink.c:1497 netlink_broadcast net/netlink/af_netlink.c:1542 [inline] nlmsg_multicast include/net/netlink.h:738 [inline] nlmsg_notify+0x93/0x1c0 net/netlink/af_netlink.c:2528 rtnl_notify net/core/rtnetlink.c:741 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3472 [inline] rtmsg_ifinfo_event.part.0+0xb0/0xe0 net/core/rtnetlink.c:3487 rtmsg_ifinfo_event net/core/rtnetlink.c:3495 [inline] rtmsg_ifinfo+0x8d/0xa0 net/core/rtnetlink.c:3493 register_netdevice+0xb45/0xff0 net/core/dev.c:8752 register_netdev+0x30/0x50 net/core/dev.c:8829 sit_init_net+0x380/0xa60 net/ipv6/sit.c:1863 ops_init+0xb6/0x410 net/core/net_namespace.c:129 setup_net+0x2c5/0x730 net/core/net_namespace.c:314 copy_net_ns+0x1d9/0x340 net/core/net_namespace.c:437 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2549 __do_sys_unshare kernel/fork.c:2617 [inline] __se_sys_unshare kernel/fork.c:2615 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2615 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88805c414cc0 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2876 bytes to the left of 4096-byte region [ffff88805c414cc0, ffff88805c415cc0) The buggy address belongs to the page: page:ffffea0001710500 count:1 mapcount:0 mapping:ffff88812c3f0dc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002151988 ffffea0001710588 ffff88812c3f0dc0 raw: 0000000000000000 ffff88805c414cc0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805c414080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805c414100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805c414180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805c414200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805c414280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================