RDX: 0000000020000540 RSI: 0000000000000001 RDI: 00007fd23245f000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 0000000000000200 R14: 00000000004c44dc R15: 00007fd2324886d4 ================================================================== BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:674 [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+0xbaa/0xd10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff88804c7676ad by task syz-executor.4/23489 CPU: 1 PID: 23489 Comm: syz-executor.4 Not tainted 4.19.128-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+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x222 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xbaa/0xd10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x424/0x4e0 drivers/video/fbdev/core/fbcon.c:1323 do_update_region+0x398/0x630 drivers/tty/vt/vt.c:683 redraw_screen+0x5e1/0x870 drivers/tty/vt/vt.c:1031 vc_do_resize+0x108e/0x1380 drivers/tty/vt/vt.c:1317 vt_ioctl+0x1fa2/0x2500 drivers/tty/vt/vt_ioctl.c:901 tty_ioctl+0x7a5/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca59 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fca17eb1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f30e0 RCX: 000000000045ca59 RDX: 0000000020000000 RSI: 000000000000560a RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000067a R14: 00000000004c973d R15: 00007fca17eb26d4 Allocated by task 22408: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2644 con_font_set drivers/tty/vt/vt.c:4529 [inline] con_font_op+0xd3e/0x1130 drivers/tty/vt/vt.c:4594 vt_ioctl+0xcd0/0x2500 drivers/tty/vt/vt_ioctl.c:928 tty_ioctl+0x7a5/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6467: __cache_free mm/slab.c:3503 [inline] kfree+0xce/0x220 mm/slab.c:3822 skb_free_head+0x91/0xb0 net/core/skbuff.c:554 skb_release_data+0x623/0x8e0 net/core/skbuff.c:574 skb_release_all+0x46/0x60 net/core/skbuff.c:631 __kfree_skb+0x11/0x20 net/core/skbuff.c:645 sk_wmem_free_skb include/net/sock.h:1462 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:1764 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3153 [inline] tcp_ack+0x1be6/0x4ba0 net/ipv4/tcp_input.c:3678 tcp_rcv_established+0x11fa/0x1c30 net/ipv4/tcp_input.c:5567 tcp_v4_do_rcv+0x605/0x8b0 net/ipv4/tcp_ipv4.c:1535 tcp_v4_rcv+0x2cc0/0x3c90 net/ipv4/tcp_ipv4.c:1820 ip_local_deliver_finish+0x495/0xc00 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x188/0x500 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:453 [inline] ip_rcv_finish+0x1ca/0x2e0 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xce/0x3c0 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4960 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5072 netif_receive_skb_internal+0xf9/0x400 net/core/dev.c:5162 napi_skb_finish net/core/dev.c:5606 [inline] napi_gro_receive+0x352/0x450 net/core/dev.c:5637 receive_buf+0xa99/0x5e90 drivers/net/virtio_net.c:1072 virtnet_receive drivers/net/virtio_net.c:1336 [inline] virtnet_poll+0x541/0xd60 drivers/net/virtio_net.c:1441 napi_poll net/core/dev.c:6277 [inline] net_rx_action+0x498/0xf70 net/core/dev.c:6343 __do_softirq+0x26c/0x93d kernel/softirq.c:292 The buggy address belongs to the object at ffff88804c767280 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1069 bytes inside of 2048-byte region [ffff88804c767280, ffff88804c767a80) The buggy address belongs to the page: page:ffffea000131d980 count:1 mapcount:0 mapping:ffff88812c3dcc40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea00023fb288 ffffea00014c4808 ffff88812c3dcc40 raw: 0000000000000000 ffff88804c766180 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804c767580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804c767600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804c767680: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804c767700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804c767780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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