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BUG: KASAN: slab-out-of-bounds in pipe_write+0xe30/0x1000 fs/pipe.c:488
Write of size 8 at addr ffff88809790eaa8 by task syz-executor479/9021

CPU: 0 PID: 9021 Comm: syz-executor479 Not tainted 5.4.0-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:634
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137
 pipe_write+0xe30/0x1000 fs/pipe.c:488
 call_write_iter include/linux/fs.h:1902 [inline]
 new_sync_write+0x4d3/0x770 fs/read_write.c:483
 __vfs_write+0xe1/0x110 fs/read_write.c:496
 vfs_write+0x268/0x5d0 fs/read_write.c:558
 ksys_write+0x220/0x290 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __ia32_sys_write+0x71/0xb0 fs/read_write.c:620
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f17a39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 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:00000000f7f1312c EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200001c0
RDX: 00000000fffffef3 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9023:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:510 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3664
 kmalloc_array include/linux/slab.h:618 [inline]
 kcalloc include/linux/slab.h:629 [inline]
 pipe_set_size fs/pipe.c:1143 [inline]
 pipe_fcntl+0x3f7/0x8e0 fs/pipe.c:1209
 do_fcntl+0x255/0x1030 fs/fcntl.c:417
 do_compat_fcntl64+0x387/0x540 fs/fcntl.c:667
 __do_compat_sys_fcntl64 fs/fcntl.c:678 [inline]
 __se_compat_sys_fcntl64 fs/fcntl.c:675 [inline]
 __ia32_compat_sys_fcntl64+0x73/0xb0 fs/fcntl.c:675
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88809790ea80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 40 bytes inside of
 64-byte region [ffff88809790ea80, ffff88809790eac0)
The buggy address belongs to the page:
page:ffffea00025e4380 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0
raw: 00fffe0000000200 ffffea00029d0c48 ffff8880aa401348 ffff8880aa400380
raw: 0000000000000000 ffff88809790e000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809790e980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809790ea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809790ea80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88809790eb00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff88809790eb80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
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