syzbot

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BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3165 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xe5/0x7f0 mm/slub.c:4224

CPU: 1 PID: 12936 Comm: syz-executor.0 Not tainted 5.12.0-rc3-next-20210316-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:357
 ____kasan_slab_free mm/kasan/common.c:340 [inline]
 __kasan_slab_free+0x120/0x130 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:212 [inline]
 slab_free_hook mm/slub.c:1580 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1605
 slab_free mm/slub.c:3165 [inline]
 kfree+0xe5/0x7f0 mm/slub.c:4224
 scsi_req_free_cmd include/scsi/scsi_request.h:28 [inline]
 sg_finish_scsi_blk_rq+0x690/0x810 drivers/scsi/sg.c:3224
 sg_common_write+0xa07/0xe70 drivers/scsi/sg.c:1132
 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797
 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660
 sg_write+0x87/0x120 drivers/scsi/sg.c:603
 vfs_write+0x28e/0xa30 fs/read_write.c:603
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465f69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe478067188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 00000000000000ab RSI: 0000000020000540 RDI: 0000000000000003
RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd10f9eb3f R14: 00007fe478067300 R15: 0000000000022000

Allocated by task 12936:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 ____kasan_kmalloc mm/kasan/common.c:507 [inline]
 ____kasan_kmalloc mm/kasan/common.c:466 [inline]
 __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:686 [inline]
 sg_start_req+0x16f/0x24e0 drivers/scsi/sg.c:3044
 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109
 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797
 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660
 sg_write+0x87/0x120 drivers/scsi/sg.c:603
 vfs_write+0x28e/0xa30 fs/read_write.c:603
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 12936:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:212 [inline]
 slab_free_hook mm/slub.c:1580 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1605
 slab_free mm/slub.c:3165 [inline]
 kfree+0xe5/0x7f0 mm/slub.c:4224
 sg_start_req+0x1b33/0x24e0 drivers/scsi/sg.c:3106
 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109
 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797
 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660
 sg_write+0x87/0x120 drivers/scsi/sg.c:603
 vfs_write+0x28e/0xa30 fs/read_write.c:603
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801c12ce00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes inside of
 256-byte region [ffff88801c12ce00, ffff88801c12cf00)
The buggy address belongs to the page:
page:ffffea0000704b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c12c
head:ffffea0000704b00 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 ffffea0000930f00 0000000600000006 ffff888010841b40
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801c12cd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801c12cd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801c12ce00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88801c12ce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801c12cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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