================================================================== BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:656 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff88809a27f40c by task syz-executor.2/32219 CPU: 0 PID: 32219 Comm: syz-executor.2 Not tainted 5.8.0-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+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 __fb_pad_aligned_buffer include/linux/fb.h:656 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:675 redraw_screen+0x64e/0x770 drivers/tty/vt/vt.c:1034 vc_do_resize+0xef0/0x1180 drivers/tty/vt/vt.c:1325 vt_resizex drivers/tty/vt/vt_ioctl.c:814 [inline] vt_ioctl+0xeba/0x2c20 drivers/tty/vt/vt_ioctl.c:1026 tty_ioctl+0x1019/0x15f0 drivers/tty/tty_io.c:2656 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ce79 Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff294c2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001c340 RCX: 000000000045ce79 RDX: 0000000020000000 RSI: 000000000000560a RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffee29c726f R14: 00007ff294c2f9c0 R15: 000000000118bf2c Allocated by task 27944: 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] fbcon_set_font+0x34f/0x8b0 drivers/video/fbdev/core/fbcon.c:2673 con_font_set drivers/tty/vt/vt.c:4662 [inline] con_font_op+0xd25/0x1110 drivers/tty/vt/vt.c:4727 vt_io_ioctl drivers/tty/vt/vt_ioctl.c:595 [inline] vt_ioctl+0x1be1/0x2c20 drivers/tty/vt/vt_ioctl.c:846 tty_ioctl+0x1019/0x15f0 drivers/tty/tty_io.c:2656 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 110: 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 sk_wmem_free_skb include/net/sock.h:1539 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:1857 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3177 [inline] tcp_ack+0x1bf0/0x5700 net/ipv4/tcp_input.c:3721 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6021 [inline] tcp_rcv_state_process+0x15e1/0x4add net/ipv4/tcp_input.c:6260 tcp_v4_do_rcv+0x320/0x870 net/ipv4/tcp_ipv4.c:1664 sk_backlog_rcv include/net/sock.h:1011 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2542 release_sock+0x54/0x1b0 net/core/sock.c:3065 inet_stream_connect+0x76/0xa0 net/ipv4/af_inet.c:726 rds_tcp_conn_path_connect+0x61c/0x880 net/rds/tcp_connect.c:172 rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff88809a27f000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 12 bytes to the right of 1024-byte region [ffff88809a27f000, ffff88809a27f400) The buggy address belongs to the page: page:ffffea0002689fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00013ec0c8 ffffea00029b3448 ffff8880aa040c40 raw: 0000000000000000 ffff88809a27f000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809a27f300: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809a27f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809a27f400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809a27f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809a27f500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================