================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: slab-out-of-bounds in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: slab-out-of-bounds in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: slab-out-of-bounds in dst_hold_safe include/net/dst.h:297 [inline] BUG: KASAN: slab-out-of-bounds in ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1071 Read of size 4 at addr ffff8880a05c26ec by task syz-executor.2/13955 CPU: 1 PID: 13955 Comm: syz-executor.2 Not tainted 5.2.0-rc3+ #23 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:94 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] dst_hold_safe include/net/dst.h:297 [inline] ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1071 rt6_get_pcpu_route net/ipv6/route.c:1300 [inline] ip6_pol_route+0x2e9/0xf40 net/ipv6/route.c:2051 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2227 fib6_rule_lookup+0x133/0x5a0 net/ipv6/fib6_rules.c:116 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2256 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0xd1f/0x1f90 net/ipv6/ip6_output.c:1022 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1150 sctp_v6_get_dst+0x785/0x1ce0 net/sctp/ipv6.c:278 sctp_transport_route+0x12d/0x360 net/sctp/transport.c:297 sctp_assoc_add_peer+0x53e/0xfc0 net/sctp/associola.c:663 sctp_process_param net/sctp/sm_make_chunk.c:2522 [inline] sctp_process_init+0x2458/0x2ad0 net/sctp/sm_make_chunk.c:2343 sctp_sf_do_unexpected_init net/sctp/sm_statefuns.c:1541 [inline] sctp_sf_do_unexpected_init.isra.0+0x7cd/0x1350 net/sctp/sm_statefuns.c:1441 sctp_sf_do_5_2_1_siminit+0x35/0x40 net/sctp/sm_statefuns.c:1670 sctp_do_sm+0x121/0x5190 net/sctp/sm_sideeffect.c:1152 sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1059 sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0xbe0 net/sctp/input.c:339 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x129/0x390 net/core/sock.c:2412 release_sock+0x59/0x1c0 net/core/sock.c:2928 sctp_wait_for_connect+0x316/0x540 net/sctp/socket.c:9039 __sctp_connect+0xab2/0xcd0 net/sctp/socket.c:1226 sctp_connect net/sctp/socket.c:4846 [inline] sctp_inet_connect+0x29c/0x340 net/sctp/socket.c:4862 __sys_connect+0x264/0x330 net/socket.c:1834 __do_sys_connect net/socket.c:1845 [inline] __se_sys_connect net/socket.c:1842 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1842 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fed51760c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 000000000000001c RSI: 0000000020000080 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fed517616d4 R13: 00000000004bf74d R14: 00000000004d0eb8 R15: 00000000ffffffff Allocated by task 26971: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3660 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3669 kmalloc include/linux/slab.h:552 [inline] tomoyo_realpath_from_path+0xcd/0x7a0 security/tomoyo/realpath.c:277 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x230/0x430 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129 security_inode_getattr+0xf2/0x150 security/security.c:1179 vfs_getattr+0x25/0x70 fs/stat.c:115 vfs_statx+0x157/0x200 fs/stat.c:191 vfs_stat include/linux/fs.h:3193 [inline] __do_sys_newstat+0xa4/0x130 fs/stat.c:341 __se_sys_newstat fs/stat.c:337 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:337 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 26971: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 tomoyo_realpath_from_path+0x1de/0x7a0 security/tomoyo/realpath.c:319 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x230/0x430 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129 security_inode_getattr+0xf2/0x150 security/security.c:1179 vfs_getattr+0x25/0x70 fs/stat.c:115 vfs_statx+0x157/0x200 fs/stat.c:191 vfs_stat include/linux/fs.h:3193 [inline] __do_sys_newstat+0xa4/0x130 fs/stat.c:341 __se_sys_newstat fs/stat.c:337 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:337 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a05c2dc0 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1748 bytes to the left of 4096-byte region [ffff8880a05c2dc0, ffff8880a05c3dc0) The buggy address belongs to the page: page:ffffea0002817080 refcount:1 mapcount:0 mapping:ffff8880aa400dc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00026bc708 ffffea000120ab08 ffff8880aa400dc0 raw: 0000000000000000 ffff8880a05c2dc0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a05c2580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a05c2600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a05c2680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a05c2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a05c2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================