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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 ffff88809eded5bc by task syz-executor.0/1507

CPU: 0 PID: 1507 Comm: syz-executor.0 Not tainted 5.2.0+ #67
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+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+0x374/0xda0 arch/x86/net/bpf_jit_comp.c:1132
 bpf_prog_select_runtime+0x4cd/0x7d0 kernel/bpf/core.c:1726
 bpf_prog_load+0xe9b/0x1670 kernel/bpf/syscall.c:1702
 __do_sys_bpf+0xa46/0x42f0 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: 0033:0x459829
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:00007f7818237c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000048 RSI: 0000000020000100 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f78182386d4
R13: 00000000004bfc7c R14: 00000000004d1838 R15: 00000000ffffffff

Allocated by task 1049:
 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+0x163/0x770 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_path_perm+0x33e/0x430 security/tomoyo/file.c:831
 tomoyo_path_symlink+0xaa/0xf0 security/tomoyo/tomoyo.c:206
 security_path_symlink+0x10a/0x170 security/security.c:1013
 do_symlinkat+0x137/0x290 fs/namei.c:4152
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1049:
 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/0x2c0 mm/slab.c:3756
 tomoyo_path_perm+0x38e/0x430 security/tomoyo/file.c:840
 tomoyo_path_symlink+0xaa/0xf0 security/tomoyo/tomoyo.c:206
 security_path_symlink+0x10a/0x170 security/security.c:1013
 do_symlinkat+0x137/0x290 fs/namei.c:4152
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
 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 ffff88809eded580
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes to the right of
 32-byte region [ffff88809eded580, ffff88809eded5a0)
The buggy address belongs to the page:
page:ffffea00027b7b40 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809ededfc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000295d3c8 ffffea0002609ac8 ffff8880aa4001c0
raw: ffff88809ededfc1 ffff88809eded000 000000010000003b 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809eded480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809eded500: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88809eded580: fb fb fb fb fc fc fc fc 00 04 fc fc fc fc fc fc
                                        ^
 ffff88809eded600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809eded680: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
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