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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 ffff8880a90ca0fc by task syz-executor.1/5601

CPU: 0 PID: 5601 Comm: syz-executor.1 Not tainted 5.2.0+ #41
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+0x12/0x20 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:00007f3971f8dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000048 RSI: 000000002000e000 RDI: 0000000000000005
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3971f8e6d4
R13: 00000000004bfc7c R14: 00000000004d16d8 R15: 00000000ffffffff

Allocated by task 4249:
 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+0x163/0x780 mm/slab.c:3664
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 lsm_cred_alloc security/security.c:466 [inline]
 security_prepare_creds+0x11d/0x190 security/security.c:1514
 prepare_creds+0x2f5/0x3f0 kernel/cred.c:281
 do_faccessat+0xa2/0x7f0 fs/open.c:360
 __do_sys_access fs/open.c:431 [inline]
 __se_sys_access fs/open.c:429 [inline]
 __x64_sys_access+0x59/0x80 fs/open.c:429
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4247:
 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
 security_cred_free+0xa9/0x110 security/security.c:1508
 put_cred_rcu+0x129/0x4b0 kernel/cred.c:114
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2114 [inline]
 rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323
 __do_softirq+0x262/0x98c kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a90ca0c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes to the right of
 32-byte region [ffff8880a90ca0c0, ffff8880a90ca0e0)
The buggy address belongs to the page:
page:ffffea0002a43280 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a90cafc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002904248 ffffea00023e7048 ffff8880aa4001c0
raw: ffff8880a90cafc1 ffff8880a90ca000 0000000100000027 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a90c9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a90ca000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a90ca080: 00 01 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                                                                ^
 ffff8880a90ca100: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a90ca180: 00 04 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
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