================================================================== BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_add+0x1481/0x3230 net/key/af_key.c:1506 Read of size 5504 at addr ffff8801cf5ce040 by task syz-executor4/12608 CPU: 0 PID: 12608 Comm: syz-executor4 Not tainted 4.9.108-gb7d377b #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff880194e276e0 ffffffff81eb3e29 ffffea00073d7380 ffff8801cf5ce040 0000000000000000 ffff8801cf5ce200 ffff8801cf5ce000 ffff880194e27718 ffffffff81567a89 ffff8801cf5ce040 0000000000001580 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] check_memory_region_inline mm/kasan/kasan.c:318 [inline] [] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:325 [] memcpy+0x23/0x50 mm/kasan/kasan.c:360 [] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline] [] pfkey_add+0x1481/0x3230 net/key/af_key.c:1506 [] pfkey_process+0x671/0x740 net/key/af_key.c:2834 [] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:645 [] ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969 [] __sys_sendmsg+0xd9/0x190 net/socket.c:2003 [] SYSC_sendmsg net/socket.c:2014 [inline] [] SyS_sendmsg+0x2d/0x50 net/socket.c:2010 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 12608: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] __kmalloc_track_caller+0xdc/0x2b0 mm/slub.c:4232 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138 __alloc_skb+0x11a/0x600 net/core/skbuff.c:231 alloc_skb include/linux/skbuff.h:919 [inline] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xcc/0x110 net/socket.c:645 ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969 __sys_sendmsg+0xd9/0x190 net/socket.c:2003 SYSC_sendmsg net/socket.c:2014 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2010 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 2042: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xfb/0x310 mm/slub.c:3878 skb_free_head+0x8b/0xb0 net/core/skbuff.c:580 skb_release_data+0x329/0x400 net/core/skbuff.c:611 skb_release_all+0x4a/0x60 net/core/skbuff.c:670 __kfree_skb net/core/skbuff.c:684 [inline] consume_skb+0xc6/0x340 net/core/skbuff.c:757 netlink_broadcast_filtered+0x2ae/0x9f0 net/netlink/af_netlink.c:1479 kobject_uevent_env+0x6d8/0xb80 lib/kobject_uevent.c:316 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374 uevent_store+0x8a/0xe0 drivers/base/core.c:420 dev_attr_store+0x5e/0x90 drivers/base/core.c:137 sysfs_kf_write+0x114/0x180 fs/sysfs/file.c:141 kernfs_fop_write+0x2ae/0x460 fs/kernfs/file.c:316 __vfs_write+0x115/0x580 fs/read_write.c:507 vfs_write+0x187/0x530 fs/read_write.c:557 SYSC_write fs/read_write.c:604 [inline] SyS_write+0xd9/0x1c0 fs/read_write.c:596 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the object at ffff8801cf5ce000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of 512-byte region [ffff8801cf5ce000, ffff8801cf5ce200) The buggy address belongs to the page: page:ffffea00073d7380 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cf5ce100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cf5ce180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801cf5ce200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801cf5ce280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cf5ce300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================