binder_alloc: 2935: binder_alloc_buf, no vma binder: 18545:18547 transaction failed 29189/-3, size 0-0 line 3274 ================================================================== binder: BINDER_SET_CONTEXT_MGR already set BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:912 [inline] BUG: KASAN: use-after-free in tcp_init_tso_segs+0x19d/0x1f0 net/ipv4/tcp_output.c:1790 Read of size 2 at addr ffff8881d3d811b0 by task syz-executor.1/18550 binder: 18545:18547 ioctl 40046207 0 returned -16 CPU: 1 PID: 18550 Comm: syz-executor.1 Not tainted 4.14.143+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 print_address_description+0x60/0x226 mm/kasan/report.c:187 binder: 18545:18547 BC_INCREFS_DONE u0000000000000000 no match binder_alloc: 2935: binder_alloc_buf, no vma __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316 tcp_skb_pcount include/net/tcp.h:912 [inline] tcp_init_tso_segs+0x19d/0x1f0 net/ipv4/tcp_output.c:1790 binder: 18545:18547 transaction failed 29189/-3, size 0-0 line 3274 tcp_write_xmit+0x15a/0x4730 net/ipv4/tcp_output.c:2330 binder_alloc: 2935: binder_alloc_buf, no vma __tcp_push_pending_frames+0xa0/0x230 net/ipv4/tcp_output.c:2563 binder: 18545:18547 transaction failed 29189/-3, size 0-0 line 3274 tcp_send_fin+0x154/0xbc0 net/ipv4/tcp_output.c:3115 tcp_shutdown net/ipv4/tcp.c:2117 [inline] tcp_shutdown+0xd5/0x100 net/ipv4/tcp.c:2102 inet_shutdown+0x16f/0x350 net/ipv4/af_inet.c:830 binder: BINDER_SET_CONTEXT_MGR already set SYSC_shutdown net/socket.c:1917 [inline] SyS_shutdown+0xe6/0x190 net/socket.c:1908 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 binder: 18545:18559 BC_INCREFS_DONE u0000000000000000 no match RIP: 0033:0x4598e9 RSP: 002b:00007fd9f4d8ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004598e9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd9f4d8f6d4 R13: 00000000004c8463 R14: 00000000004df000 R15: 00000000ffffffff Allocated by task 18550: save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:439 [inline] slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2800 [inline] kmem_cache_alloc+0xee/0x360 mm/slub.c:2805 kmem_cache_alloc_node include/linux/slab.h:361 [inline] __alloc_skb+0xea/0x5c0 net/core/skbuff.c:193 alloc_skb_fclone include/linux/skbuff.h:1022 [inline] sk_stream_alloc_skb+0xf4/0x8a0 net/ipv4/tcp.c:855 tcp_sendmsg_locked+0xf11/0x2f50 net/ipv4/tcp.c:1301 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x15b/0x520 net/ipv4/af_inet.c:760 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb7/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1de/0x2f0 net/socket.c:1731 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 binder: 18545:18558 ioctl 40046207 0 returned -16 entry_SYSCALL_64_after_hwframe+0x42/0xb7 0xffffffffffffffff Freed by task 18550: save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x164/0x210 mm/kasan/common.c:457 slab_free_hook mm/slub.c:1407 [inline] slab_free_freelist_hook mm/slub.c:1458 [inline] slab_free mm/slub.c:3039 [inline] kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055 kfree_skbmem+0x84/0x110 net/core/skbuff.c:607 sk_wmem_free_skb include/net/sock.h:1416 [inline] tcp_remove_empty_skb net/ipv4/tcp.c:929 [inline] tcp_remove_empty_skb+0x264/0x320 net/ipv4/tcp.c:923 tcp_sendmsg_locked+0x1c09/0x2f50 net/ipv4/tcp.c:1435 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x15b/0x520 net/ipv4/af_inet.c:760 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb7/0x100 net/socket.c:656 binder_alloc: 2935: binder_alloc_buf, no vma SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1de/0x2f0 net/socket.c:1731 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 0xffffffffffffffff The buggy address belongs to the object at ffff8881d3d81180 which belongs to the cache skbuff_fclone_cache of size 456 The buggy address is located 48 bytes inside of 456-byte region [ffff8881d3d81180, ffff8881d3d81348) The buggy address belongs to the page: page:ffffea00074f6000 count:1 mapcount:0 mapping: (null) index:0xffff8881d3d80f00 compound_mapcount: 0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 ffff8881d3d80f00 00000001800c000b raw: ffffea00071c6480 0000000400000004 ffff8881dab70400 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d3d81080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff8881d3d81100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881d3d81180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb binder: 18545:18559 transaction failed 29189/-3, size 0-0 line 3274 ^ ffff8881d3d81200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d3d81280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================