ISOFS: Unable to identify CD-ROM format. ================================================================== BUG: KASAN: use-after-free in __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] BUG: KASAN: use-after-free in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: use-after-free in bit_putcs+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff888058a67d8a by task syz-executor.4/19090 CPU: 1 PID: 19090 Comm: syz-executor.4 Not tainted 4.19.134-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+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x336/0x4f0 drivers/video/fbdev/core/fbcon.c:1323 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:683 redraw_screen+0x5e1/0x870 drivers/tty/vt/vt.c:1031 vc_do_resize+0x1132/0x1440 drivers/tty/vt/vt.c:1317 vt_ioctl+0x1f74/0x24d0 drivers/tty/vt/vt_ioctl.c:901 tty_ioctl+0x5b0/0x15c0 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/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: 0033:0x45c369 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:00007fa827904c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001ba00 RCX: 000000000045c369 RDX: 0000000020000040 RSI: 000000000000560a RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff27fbcaaf R14: 00007fa8279059c0 R15: 000000000078bf0c Allocated by task 18197: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] alloc_skb_with_frags+0x92/0x570 net/core/skbuff.c:5303 sock_alloc_send_pskb+0x6e1/0x830 net/core/sock.c:2090 __ip6_append_data.isra.0+0x1ab2/0x2d70 net/ipv6/ip6_output.c:1422 ip6_append_data+0x1e7/0x330 net/ipv6/ip6_output.c:1591 icmp6_send+0x17c4/0x2230 net/ipv6/icmp.c:576 icmpv6_send+0xde/0x210 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x26/0x4e0 net/ipv6/route.c:2297 dst_link_failure include/net/dst.h:438 [inline] vti_xmit net/ipv4/ip_vti.c:300 [inline] vti_tunnel_xmit+0x49f/0x18c0 net/ipv4/ip_vti.c:336 __netdev_start_xmit include/linux/netdevice.h:4333 [inline] netdev_start_xmit include/linux/netdevice.h:4347 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x7eb/0xc10 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:455 [inline] ip6_local_out+0xaf/0x170 net/ipv6/output_core.c:178 ip6_send_skb+0xb3/0x300 net/ipv6/ip6_output.c:1699 udp_v6_send_skb+0x7d7/0x1610 net/ipv6/udp.c:1111 udpv6_sendmsg+0x236b/0x2a90 net/ipv6/udp.c:1408 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18197: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 skb_free_head net/core/skbuff.c:554 [inline] skb_release_data+0x6de/0x920 net/core/skbuff.c:574 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0x11a/0x3d0 net/core/skbuff.c:663 icmpv6_rcv+0x70c/0x17c0 net/ipv6/icmp.c:925 ip6_input_finish+0x46a/0x17a0 net/ipv6/ip6_input.c:395 NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0xcf/0x3c0 net/ipv6/ip6_input.c:438 dst_input include/net/dst.h:461 [inline] ip6_rcv_finish+0x1d9/0x2f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0xf2/0x3f0 net/ipv6/ip6_input.c:283 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 process_backlog+0x239/0x6f0 net/core/dev.c:5848 napi_poll net/core/dev.c:6271 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6337 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 The buggy address belongs to the object at ffff888058a67d00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 138 bytes inside of 512-byte region [ffff888058a67d00, ffff888058a67f00) The buggy address belongs to the page: page:ffffea00016299c0 count:1 mapcount:0 mapping:ffff88812c39c940 index:0xffff888058a67800 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00023a6c48 ffffea0002971208 ffff88812c39c940 raw: ffff888058a67800 ffff888058a67080 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888058a67c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888058a67d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888058a67d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888058a67e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888058a67e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================