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BUG: KASAN: slab-out-of-bounds in do_jit.isra.0+0x4c35/0x5630 /arch/x86/net/bpf_jit_comp.c:966
Read of size 4 at addr ffff8880a7a24cbc by task syz-executor476/8779

CPU: 0 PID: 8779 Comm: syz-executor476 Not tainted 5.2.0+ #71
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+0x16f/0x1f0 /lib/dump_stack.c:113
 print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351
 __kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482
 kasan_report+0x12/0x17 /mm/kasan/common.c:612
 __asan_report_load4_noabort+0x14/0x20 /mm/kasan/generic_report.c:131
 do_jit.isra.0+0x4c35/0x5630 /arch/x86/net/bpf_jit_comp.c:966
 bpf_int_jit_compile+0x379/0xda5 /arch/x86/net/bpf_jit_comp.c:1132
 bpf_prog_select_runtime+0x4cd/0x7d0 /kernel/bpf/core.c:1725
 bpf_prog_load+0xe9b/0x1640 /kernel/bpf/syscall.c:1702
 __do_sys_bpf+0xa23/0x4240 /kernel/bpf/syscall.c:2849
 __se_sys_bpf /kernel/bpf/syscall.c:2808 [inline]
 __x64_sys_bpf+0x73/0xb0 /kernel/bpf/syscall.c:2808
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4402c9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe6d6fe968 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402c9
RDX: 0000000000000046 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401b50
R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3802:
 save_stack+0x23/0x90 /mm/kasan/common.c:69
 set_track /mm/kasan/common.c:77 [inline]
 __kasan_kmalloc /mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 /mm/kasan/common.c:460
 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501
 __do_kmalloc /mm/slab.c:3655 [inline]
 __kmalloc+0x163/0x760 /mm/slab.c:3664
 kmalloc /./include/linux/slab.h:557 [inline]
 kzalloc /./include/linux/slab.h:748 [inline]
 tomoyo_encode2.part.0+0xf5/0x400 /security/tomoyo/realpath.c:44
 tomoyo_encode2 /security/tomoyo/realpath.c:30 [inline]
 tomoyo_encode+0x2b/0x50 /security/tomoyo/realpath.c:79
 tomoyo_realpath_from_path+0x1d3/0x7b0 /security/tomoyo/realpath.c:316
 tomoyo_get_realpath /security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x1dd/0x520 /security/tomoyo/file.c:723
 tomoyo_file_ioctl+0x23/0x30 /security/tomoyo/tomoyo.c:335
 security_file_ioctl+0x77/0xc0 /security/security.c:1369
 ksys_ioctl+0x57/0xd0 /fs/ioctl.c:711
 __do_sys_ioctl /fs/ioctl.c:720 [inline]
 __se_sys_ioctl /fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 /fs/ioctl.c:718
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 3802:
 save_stack+0x23/0x90 /mm/kasan/common.c:69
 set_track /mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 /mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457
 __cache_free /mm/slab.c:3425 [inline]
 kfree+0x10a/0x2a0 /mm/slab.c:3756
 tomoyo_path_number_perm+0x459/0x520 /security/tomoyo/file.c:736
 tomoyo_file_ioctl+0x23/0x30 /security/tomoyo/tomoyo.c:335
 security_file_ioctl+0x77/0xc0 /security/security.c:1369
 ksys_ioctl+0x57/0xd0 /fs/ioctl.c:711
 __do_sys_ioctl /fs/ioctl.c:720 [inline]
 __se_sys_ioctl /fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 /fs/ioctl.c:718
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a7a24c80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes to the right of
 32-byte region [ffff8880a7a24c80, ffff8880a7a24ca0)
The buggy address belongs to the page:
page:ffffea00029e8900 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a7a24fc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00029a3488 ffffea0002912dc8 ffff8880aa4001c0
raw: ffff8880a7a24fc1 ffff8880a7a24000 0000000100000026 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7a24b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a7a24c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a7a24c80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
                                        ^
 ffff8880a7a24d00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a7a24d80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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