RBP: 00007fb418d821d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000a9fb1f R14: 00007fb418d82300 R15: 0000000000022000 dccp_parse_options: DCCP(ffff888015f79f80): Option 32 (len=7) error=9 ================================================================== BUG: KASAN: use-after-free in dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x22a6/0x2610 net/dccp/ccids/ccid2.c:592 Read of size 1 at addr ffff88801e6964a2 by task syz-executor.0/7822 CPU: 0 PID: 7822 Comm: syz-executor.0 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] ccid2_hc_tx_packet_recv+0x22a6/0x2610 net/dccp/ccids/ccid2.c:592 ccid_hc_tx_packet_recv net/dccp/ccid.h:189 [inline] dccp_deliver_input_to_ccids+0x1db/0x250 net/dccp/input.c:182 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x107/0x160 net/dccp/input.c:364 dccp_v6_do_rcv+0x989/0xba0 net/dccp/ipv6.c:621 sk_backlog_rcv include/net/sock.h:1023 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2655 release_sock+0x54/0x1b0 net/core/sock.c:3179 dccp_sendmsg+0x67a/0xc90 net/dccp/proto.c:796 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x331/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmmsg+0x195/0x470 net/socket.c:2532 __do_sys_sendmmsg net/socket.c:2561 [inline] __se_sys_sendmmsg net/socket.c:2558 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2558 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb418d82188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 04000000000000d0 RSI: 0000000020003d40 RDI: 0000000000000004 RBP: 00007fb418d821d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000a9fb1f R14: 00007fb418d82300 R15: 0000000000022000 Allocated by task 3130: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1808 sk_alloc+0x32/0xbc0 net/core/sock.c:1861 af_alg_accept+0x99/0x5d0 crypto/af_alg.c:292 __sys_accept4_file+0x3b2/0x5b0 net/socket.c:1778 __sys_accept4+0xb0/0x100 net/socket.c:1829 __do_sys_accept net/socket.c:1847 [inline] __se_sys_accept net/socket.c:1844 [inline] __x64_sys_accept+0x71/0xb0 net/socket.c:1844 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 7822: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1628 [inline] slab_free_freelist_hook+0xe3/0x250 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kfree+0xe4/0x540 mm/slub.c:4267 skb_free_head net/core/skbuff.c:654 [inline] skb_release_data+0x65a/0x790 net/core/skbuff.c:676 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb net/core/skbuff.c:755 [inline] kfree_skb net/core/skbuff.c:773 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:767 dccp_v6_do_rcv+0x95a/0xba0 net/dccp/ipv6.c:664 sk_backlog_rcv include/net/sock.h:1023 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2655 release_sock+0x54/0x1b0 net/core/sock.c:3179 dccp_sendmsg+0x67a/0xc90 net/dccp/proto.c:796 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x331/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmmsg+0x195/0x470 net/socket.c:2532 __do_sys_sendmmsg net/socket.c:2561 [inline] __se_sys_sendmmsg net/socket.c:2558 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2558 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801e696000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1186 bytes inside of 2048-byte region [ffff88801e696000, ffff88801e696800) The buggy address belongs to the page: page:ffffea000079a400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e690 head:ffffea000079a400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 8524483335, free_ts 0 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4168 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390 __alloc_pages_node include/linux/gfp.h:570 [inline] alloc_slab_page mm/slub.c:1693 [inline] allocate_slab+0x96/0x4b0 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2803 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843 slab_alloc_node mm/slub.c:2925 [inline] __kmalloc_node+0x2df/0x380 mm/slub.c:4159 kmalloc_array_node include/linux/slab.h:684 [inline] kcalloc_node include/linux/slab.h:689 [inline] blk_mq_alloc_rq_map+0x98/0x1d0 block/blk-mq.c:2385 blk_mq_sched_alloc_tags block/blk-mq-sched.c:525 [inline] blk_mq_init_sched+0x22a/0x10e0 block/blk-mq-sched.c:612 elevator_init_mq block/elevator.c:694 [inline] elevator_init_mq+0x39d/0x480 block/elevator.c:671 __device_add_disk+0x5b9/0xd10 block/genhd.c:474 add_disk include/linux/genhd.h:217 [inline] loop_add+0x6ec/0x8c0 drivers/block/loop.c:2395 loop_init+0x1f4/0x216 drivers/block/loop.c:2574 do_one_initcall+0x103/0x650 init/main.c:1287 do_initcall_level init/main.c:1360 [inline] do_initcalls init/main.c:1376 [inline] do_basic_setup init/main.c:1396 [inline] kernel_init_freeable+0x6b8/0x741 init/main.c:1598 kernel_init+0x1a/0x1d0 init/main.c:1490 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page_owner free stack trace missing Memory state around the buggy address: ffff88801e696380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e696400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801e696480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801e696500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e696580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================