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BUG: KASAN: use-after-free in mpi_free+0x117/0x150 lib/mpi/mpiutil.c:114
Read of size 4 at addr ffff8801d8db8350 by task syz-executor0/4222

CPU: 0 PID: 4222 Comm: syz-executor0 Not tainted 4.14.0+ #86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 mpi_free+0x117/0x150 lib/mpi/mpiutil.c:114
 dh_clear_params crypto/dh.c:26 [inline]
 dh_free_ctx crypto/dh.c:34 [inline]
 dh_exit_tfm+0x3d/0x140 crypto/dh.c:161
 crypto_kpp_exit_tfm+0x52/0x70 crypto/kpp.c:63
 crypto_exit_ops crypto/api.c:314 [inline]
 crypto_destroy_tfm+0xb9/0x2e0 crypto/api.c:578
 crypto_free_kpp include/crypto/kpp.h:165 [inline]
 __keyctl_dh_compute+0x1087/0x1a00 security/keys/dh.c:412
 compat_keyctl_dh_compute+0x2bb/0x3e0 security/keys/compat_dh.c:39
 C_SYSC_keyctl security/keys/compat.c:136 [inline]
 compat_SyS_keyctl+0x72/0x2c0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7efdc79
RSP: 002b:00000000f76f901c EFLAGS: 00000296 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000017 RCX: 0000000020746ff4
RDX: 00000000206fefe0 RSI: 0000000000000000 RDI: 00000000208eafc8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 4222:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3628
 kmalloc include/linux/slab.h:494 [inline]
 mpi_alloc+0x4b/0x230 lib/mpi/mpiutil.c:34
 mpi_read_raw_data+0x1e5/0x440 lib/mpi/mpicoder.c:57
 dh_set_params crypto/dh.c:69 [inline]
 dh_set_secret+0x257/0x600 crypto/dh.c:94
 crypto_kpp_set_secret include/crypto/kpp.h:291 [inline]
 __keyctl_dh_compute+0x9cf/0x1a00 security/keys/dh.c:333
 compat_keyctl_dh_compute+0x2bb/0x3e0 security/keys/compat_dh.c:39
 C_SYSC_keyctl security/keys/compat.c:136 [inline]
 compat_SyS_keyctl+0x72/0x2c0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125

Freed by task 4222:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3504 [inline]
 kfree+0xca/0x250 mm/slab.c:3821
 mpi_free+0xcb/0x150 lib/mpi/mpiutil.c:121
 dh_set_params crypto/dh.c:75 [inline]
 dh_set_secret+0x3e5/0x600 crypto/dh.c:94
 crypto_kpp_set_secret include/crypto/kpp.h:291 [inline]
 __keyctl_dh_compute+0x9cf/0x1a00 security/keys/dh.c:333
 compat_keyctl_dh_compute+0x2bb/0x3e0 security/keys/compat_dh.c:39
 C_SYSC_keyctl security/keys/compat.c:136 [inline]
 compat_SyS_keyctl+0x72/0x2c0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125

The buggy address belongs to the object at ffff8801d8db8340
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801d8db8340, ffff8801d8db8360)
The buggy address belongs to the page:
page:ffffea0007636e00 count:1 mapcount:0 mapping:ffff8801d8db8000 index:0xffff8801d8db8fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d8db8000 ffff8801d8db8fc1 000000010000003f
raw: ffffea000764b3e0 ffffea000763e320 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d8db8200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d8db8280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d8db8300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                                                 ^
 ffff8801d8db8380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d8db8400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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