================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:381 [inline] BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x7c6/0x12b0 drivers/tty/vt/vt.c:1280 Read of size 192 at addr ffff888092dc7540 by task syz-executor.5/23487 CPU: 0 PID: 23487 Comm: syz-executor.5 Not tainted 5.7.0-syzkaller #0 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+0x12d/0x187 lib/dump_stack.c:118 print_address_description.constprop.8.cold.10+0x9/0x41c mm/kasan/report.c:382 __kasan_report.cold.11+0x23/0x3a mm/kasan/report.c:511 kasan_report+0x38/0x50 mm/kasan/common.c:625 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x1cc/0x1f0 mm/kasan/generic.c:192 memcpy+0x23/0x60 mm/kasan/common.c:106 memcpy include/linux/string.h:381 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0x7c6/0x12b0 drivers/tty/vt/vt.c:1280 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1334 fbcon_modechanged+0x304/0x6d0 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x467/0x660 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xcb/0x150 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0xc1/0x110 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:778 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45b349 Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd1b99a9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd1b99aa6d4 RCX: 000000000045b349 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c Allocated by task 23487: save_stack+0x21/0x50 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc.constprop.17+0xc7/0xd0 mm/kasan/common.c:495 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:509 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x164/0x790 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:669 [inline] vc_do_resize+0x1de/0x12b0 drivers/tty/vt/vt.c:1217 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1334 fbcon_modechanged+0x304/0x6d0 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1056 fbcon_resize+0x52b/0x680 drivers/video/fbdev/core/fbcon.c:2231 resize_screen drivers/tty/vt/vt.c:1156 [inline] vc_do_resize+0x36c/0x12b0 drivers/tty/vt/vt.c:1235 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1334 fbcon_modechanged+0x304/0x6d0 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x467/0x660 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xcb/0x150 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0xc1/0x110 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:778 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 7076: save_stack+0x21/0x50 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:456 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3426 [inline] kfree+0x108/0x2c0 mm/slab.c:3757 skb_free_head+0x6e/0x90 net/core/skbuff.c:590 skb_release_data+0x28a/0x3f0 net/core/skbuff.c:610 skb_release_all+0x3d/0x50 net/core/skbuff.c:664 __kfree_skb net/core/skbuff.c:678 [inline] consume_skb+0xad/0x2d0 net/core/skbuff.c:837 netlink_broadcast_filtered+0x2c2/0xab0 net/netlink/af_netlink.c:1513 netlink_broadcast net/netlink/af_netlink.c:1535 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0x69/0x180 net/netlink/af_netlink.c:2512 rtnl_notify+0x86/0xe0 net/core/rtnetlink.c:737 mpls_netconf_notify_devconf+0x81/0xd0 net/mpls/af_mpls.c:1199 mpls_dev_sysctl_register+0x1fd/0x2c0 net/mpls/af_mpls.c:1425 mpls_add_dev net/mpls/af_mpls.c:1472 [inline] mpls_dev_notify+0x1d3/0x600 net/mpls/af_mpls.c:1598 notifier_call_chain+0x8a/0x160 kernel/notifier.c:83 __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:368 call_netdevice_notifiers_info+0x87/0xd0 net/core/dev.c:1948 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] register_netdevice+0xb8e/0x1030 net/core/dev.c:9435 veth_newlink+0x4e4/0x9e0 drivers/net/veth.c:1393 __rtnl_newlink+0xcdc/0x1480 net/core/rtnetlink.c:3333 rtnl_newlink+0x61/0x90 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x34a/0x8d0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x13c/0x380 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5472 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x474/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:672 __sys_sendto+0x1f8/0x2e0 net/socket.c:2000 __do_sys_sendto net/socket.c:2012 [inline] __se_sys_sendto net/socket.c:2008 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:2008 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff888092dc7400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 320 bytes inside of 512-byte region [ffff888092dc7400, ffff888092dc7600) The buggy address belongs to the page: page:ffffea00024b71c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00024be0c8 ffffea0002206148 ffff8880aa400a80 raw: 0000000000000000 ffff888092dc7000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888092dc7480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888092dc7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888092dc7580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888092dc7600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888092dc7680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================