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BUG: KASAN: slab-out-of-bounds in rmd320_final+0x211/0x250 crypto/rmd320.c:358
Write of size 4 at addr ffff880188f897c0 by task syz-executor7/30462

CPU: 0 PID: 30462 Comm: syz-executor7 Not tainted 4.18.0-rc1+ #12
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+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437
 rmd320_final+0x211/0x250 crypto/rmd320.c:358
 crypto_shash_final+0x104/0x260 crypto/shash.c:152
 kdf_ctr security/keys/dh.c:186 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:217 [inline]
 __keyctl_dh_compute+0x1198/0x1be0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2d0/0x400 security/keys/compat_dh.c:39
 __do_compat_sys_keyctl security/keys/compat.c:136 [inline]
 __se_compat_sys_keyctl security/keys/compat.c:59 [inline]
 __ia32_compat_sys_keyctl+0x137/0x3b0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fdfcb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f5fdb0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000017 RCX: 00000000200019c0
RDX: 0000000020001a00 RSI: 000000000000009d RDI: 00000000200000c0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 30462:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x14e/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:518 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:211 [inline]
 __keyctl_dh_compute+0x1000/0x1be0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2d0/0x400 security/keys/compat_dh.c:39
 __do_compat_sys_keyctl security/keys/compat.c:136 [inline]
 __se_compat_sys_keyctl security/keys/compat.c:59 [inline]
 __ia32_compat_sys_keyctl+0x137/0x3b0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 77:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 tc_action_net_exit include/net/act_api.h:137 [inline]
 pedit_exit_net+0x1b2/0x460 net/sched/act_pedit.c:460
 ops_exit_list.isra.7+0x105/0x160 net/core/net_namespace.c:155
 cleanup_net+0x537/0xb50 net/core/net_namespace.c:523
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

The buggy address belongs to the object at ffff880188f89700
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes to the right of
 192-byte region [ffff880188f89700, ffff880188f897c0)
The buggy address belongs to the page:
page:ffffea000623e240 count:1 mapcount:0 mapping:ffff8801da800040 index:0xffff880188f89800
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea000585bbc8 ffffea0005829148 ffff8801da800040
raw: ffff880188f89800 ffff880188f89000 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880188f89680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff880188f89700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff880188f89780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff880188f89800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880188f89880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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