================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [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+0x9d6/0x13f0 drivers/tty/vt/vt.c:1286 Read of size 320 at addr ffff888096ee81c0 by task syz-executor.2/17920 CPU: 1 PID: 17920 Comm: syz-executor.2 Not tainted 5.8.0-rc7-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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 memcpy+0x20/0x60 mm/kasan/common.c:105 memcpy include/linux/string.h:406 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0x9d6/0x13f0 drivers/tty/vt/vt.c:1286 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990 fbcon_set_all_vcs+0x3b6/0x470 drivers/video/fbdev/core/fbcon.c:3039 fbcon_update_vcs+0x26/0x50 drivers/video/fbdev/core/fbcon.c:3046 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c369 Code: 8d 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe1a3d67c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045c369 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe8e51d22f R14: 00007fe1a3d689c0 R15: 000000000078bf0c Allocated by task 17920: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x17a/0x340 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:669 [inline] vc_do_resize+0x2ff/0x13f0 drivers/tty/vt/vt.c:1223 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056 fbcon_resize+0x575/0x610 drivers/video/fbdev/core/fbcon.c:2231 resize_screen drivers/tty/vt/vt.c:1170 [inline] vc_do_resize+0x53e/0x13f0 drivers/tty/vt/vt.c:1241 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990 fbcon_set_all_vcs+0x3b6/0x470 drivers/video/fbdev/core/fbcon.c:3039 fbcon_update_vcs+0x26/0x50 drivers/video/fbdev/core/fbcon.c:3046 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 17467: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 skb_free_head net/core/skbuff.c:590 [inline] skb_release_data+0x6d9/0x910 net/core/skbuff.c:610 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:678 tcp_collapse_one+0x10a/0x1d0 net/ipv4/tcp_input.c:4919 tcp_collapse+0xdc0/0x16f0 net/ipv4/tcp_input.c:5037 tcp_collapse_ofo_queue net/ipv4/tcp_input.c:5087 [inline] tcp_prune_queue net/ipv4/tcp_input.c:5175 [inline] tcp_try_rmem_schedule+0xaab/0x16e0 net/ipv4/tcp_input.c:4563 tcp_data_queue_ofo net/ipv4/tcp_input.c:4584 [inline] tcp_data_queue+0x50d/0x49d0 net/ipv4/tcp_input.c:4897 tcp_rcv_established+0x824/0x1e70 net/ipv4/tcp_input.c:5754 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1641 sk_backlog_rcv include/net/sock.h:997 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2550 release_sock+0x54/0x1b0 net/core/sock.c:3066 sk_stream_wait_memory+0x5bd/0xe60 net/core/stream.c:145 tcp_sendmsg_locked+0xcdb/0x2d00 net/ipv4/tcp.c:1401 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1441 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1995 __do_sys_sendto net/socket.c:2007 [inline] __se_sys_sendto net/socket.c:2003 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2003 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888096ee8000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 448 bytes inside of 1024-byte region [ffff888096ee8000, ffff888096ee8400) The buggy address belongs to the page: page:ffffea00025bba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888096ee8800 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002317048 ffffea0002595708 ffff8880aa000c40 raw: ffff888096ee8800 ffff888096ee8000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888096ee8180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888096ee8200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888096ee8280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888096ee8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888096ee8380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================