================================================================== BUG: KASAN: slab-out-of-bounds in pipe_write+0xe30/0x1000 fs/pipe.c:488 Write of size 8 at addr ffff88800f111fa8 by task syz-executor.2/9069 CPU: 2 PID: 9069 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 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:639 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 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] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a759 Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f47c3885c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a759 RDX: 0000000041395527 RSI: 0000000020000340 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47c38866d4 R13: 00000000004ae96a R14: 00000000006f8b90 R15: 00000000ffffffff Allocated by task 9085: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc_array include/linux/slab.h:598 [inline] kcalloc include/linux/slab.h:609 [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_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x16d/0x1e0 fs/fcntl.c:448 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88800f111f80 which belongs to the cache kmalloc-64(49:syz2) of size 64 The buggy address is located 40 bytes inside of 64-byte region [ffff88800f111f80, ffff88800f111fc0) The buggy address belongs to the page: page:ffffea00003c4440 refcount:1 mapcount:0 mapping:ffff88801cfa1c40 index:0x0 raw: 00fffe0000000200 ffff88802a6aec48 ffff88802a6aec48 ffff88801cfa1c40 raw: 0000000000000000 ffff88800f111000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800f111e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88800f111f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88800f111f80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88800f112000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88800f112080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================