bridge124: port 1(bridge_slave_0) entered disabled state device bridge_slave_0 entered promiscuous mode ================================================================== 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+0xc74/0xe10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff8880968cee7a by task syz-executor.0/15160 CPU: 0 PID: 15160 Comm: syz-executor.0 Not tainted 4.19.109-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.cold+0x7c/0x212 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+0xc74/0xe10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x434/0x4f0 drivers/video/fbdev/core/fbcon.c:1320 do_update_region+0x398/0x630 drivers/tty/vt/vt.c:677 redraw_screen+0x5e1/0x870 drivers/tty/vt/vt.c:1024 vc_do_resize+0x109e/0x13a0 drivers/tty/vt/vt.c:1298 vt_ioctl+0x1dff/0x2310 drivers/tty/vt/vt_ioctl.c:891 tty_ioctl+0x7a1/0x1420 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: 0033:0x45c849 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:00007faf5af6cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faf5af6d6d4 RCX: 000000000045c849 RDX: 0000000020000080 RSI: 000000000000560a RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000066b R14: 00000000004c93fd R15: 000000000076bf0c Allocated by task 7037: set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:137 __alloc_skb+0xef/0x5b0 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] alloc_skb_with_frags+0x92/0x560 net/core/skbuff.c:5303 sock_alloc_send_pskb+0x6b9/0x810 net/core/sock.c:2085 __ip_append_data.isra.0+0x12ee/0x24c0 net/ipv4/ip_output.c:983 ip_make_skb+0x228/0x2a0 net/ipv4/ip_output.c:1512 udp_sendmsg+0x1da4/0x25d0 net/ipv4/udp.c:1127 udpv6_sendmsg+0x1499/0x2a00 net/ipv6/udp.c:1221 inet_sendmsg+0x12e/0x590 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x3e2/0x920 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 7037: set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521 __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+0x600/0x8c0 net/core/skbuff.c:574 skb_release_all+0x46/0x60 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb net/core/skbuff.c:663 [inline] kfree_skb+0xe1/0x390 net/core/skbuff.c:657 ip_tunnel_xmit+0x60f/0x374b net/ipv4/ip_tunnel.c:795 gre_tap_xmit net/ipv4/ip_gre.c:784 [inline] gre_tap_xmit+0x3ea/0x660 net/ipv4/ip_gre.c:765 __netdev_start_xmit include/linux/netdevice.h:4314 [inline] netdev_start_xmit include/linux/netdevice.h:4323 [inline] xmit_one net/core/dev.c:3258 [inline] dev_hard_start_xmit+0x1a4/0x950 net/core/dev.c:3274 sch_direct_xmit+0x345/0xfc0 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:395 [inline] __qdisc_run+0x4df/0x1720 net/sched/sch_generic.c:403 qdisc_run include/net/pkt_sched.h:120 [inline] qdisc_run include/net/pkt_sched.h:117 [inline] __dev_xmit_skb net/core/dev.c:3453 [inline] __dev_queue_xmit+0x229a/0x3040 net/core/dev.c:3812 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0x104d/0x1740 net/ipv4/ip_output.c:229 ip_finish_output+0x721/0xcd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_mc_output+0x26c/0xec0 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:447 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x3e/0xe0 net/ipv4/ip_output.c:1446 udp_send_skb.isra.0+0x6c2/0x11f0 net/ipv4/udp.c:845 udp_sendmsg+0x1df1/0x25d0 net/ipv4/udp.c:1132 udpv6_sendmsg+0x1499/0x2a00 net/ipv6/udp.c:1221 inet_sendmsg+0x12e/0x590 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x3e2/0x920 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 The buggy address belongs to the object at ffff8880968ced80 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 250 bytes inside of 1024-byte region [ffff8880968ced80, ffff8880968cf180) The buggy address belongs to the page: page:ffffea00025a3380 count:1 mapcount:0 mapping:ffff88812c3dcac0 index:0xffff8880968cf680 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea0001620e08 ffffea0002488408 ffff88812c3dcac0 raw: ffff8880968cf680 ffff8880968ce000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880968ced00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880968ced80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880968cee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880968cee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880968cef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================