Date:   Mon, 12 Oct 2020 07:51:17 -0700
From:   syzbot <syzbot+0796b72dc61f223d8cc5@...kaller.appspotmail.com>
To:     hare@...e.de, hch@....de, jejb@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com, syzkaller-bugs@...glegroups.com
Subject: general protection fault in scsi_queue_rq

Hello,

syzbot found the following issue on:

HEAD commit:    e4fb79c7 Add linux-next specific files for 20201008
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=125c9a9f900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=568d41fe4341ed0f
dashboard link: https://syzkaller.appspot.com/bug?extid=0796b72dc61f223d8cc5
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12582fe7900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=124ac7d0500000

The issue was bisected to:

commit 2ceda20f0a99a74a82b78870f3b3e5fa93087a7f
Author: Christoph Hellwig <hch@....de>
Date:   Mon Oct 5 08:41:23 2020 +0000

    scsi: core: Move command size detection out of the fast path

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135ea777900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10dea777900000
console output: https://syzkaller.appspot.com/x/log.txt?x=175ea777900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0796b72dc61f223d8cc5@...kaller.appspotmail.com
Fixes: 2ceda20f0a99 ("scsi: core: Move command size detection out of the fast path")

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 6889 Comm: syz-executor086 Not tainted 5.9.0-rc8-next-20201008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:scsi_command_size include/scsi/scsi_common.h:24 [inline]
RIP: 0010:scsi_setup_scsi_cmnd drivers/scsi/scsi_lib.c:1186 [inline]
RIP: 0010:scsi_prepare_cmd drivers/scsi/scsi_lib.c:1565 [inline]
RIP: 0010:scsi_queue_rq+0x2155/0x3020 drivers/scsi/scsi_lib.c:1654
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 98 0c 00 00 48 8b 83 58 02 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <0f> b6 14 11 48 89 c1 83 e1 07 38 ca 7f 08 84 d2 0f 85 53 0c 00 00
RSP: 0018:ffffc90005627580 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801b6bd400 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff84aaad82 RDI: 0000000000000003
RBP: ffff888019670000 R08: 0000000000000001 R09: ffff88801b6bd7c0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801b6bd658 R14: ffff8881341bc000 R15: 0000000000000000
FS:  00007f1d217b3700(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005617bf6e4410 CR3: 000000001f08b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blk_mq_dispatch_rq_list+0x3a1/0x1eb0 block/blk-mq.c:1388
 __blk_mq_sched_dispatch_requests+0x263/0x490 block/blk-mq-sched.c:308
 blk_mq_sched_dispatch_requests+0xfb/0x180 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0x13a/0x2d0 block/blk-mq.c:1532
 __blk_mq_delay_run_hw_queue+0x522/0x5f0 block/blk-mq.c:1609
 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1662
 blk_mq_sched_insert_request+0x4d7/0x5e0 block/blk-mq-sched.c:473
 blk_execute_rq+0xd4/0x1b0 block/blk-exec.c:86
 sg_io+0x609/0xf50 block/scsi_ioctl.c:360
 scsi_cmd_ioctl+0x5ce/0x660 block/scsi_ioctl.c:808
 scsi_cmd_blk_ioctl block/scsi_ioctl.c:866 [inline]
 scsi_cmd_blk_ioctl+0xe1/0x130 block/scsi_ioctl.c:857
 sd_ioctl_common+0x17e/0x280 drivers/scsi/sd.c:1575
 sd_ioctl+0x26/0xf0 drivers/scsi/sd.c:1765
 __blkdev_driver_ioctl block/ioctl.c:228 [inline]
 blkdev_ioctl+0x2a7/0x7f0 block/ioctl.c:623
 block_ioctl+0xf9/0x140 fs/block_dev.c:1869
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446059
Code: e8 fc b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 0b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1d217b2d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 0000000000446059
RDX: 00000000200046c0 RSI: 0000000000002285 RDI: 0000000000000004
RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c
R13: 0000000020000000 R14: 00000000004ae698 R15: 0000000000000003
Modules linked in:
---[ end trace 2bb961546eae45fe ]---
RIP: 0010:scsi_command_size include/scsi/scsi_common.h:24 [inline]
RIP: 0010:scsi_setup_scsi_cmnd drivers/scsi/scsi_lib.c:1186 [inline]
RIP: 0010:scsi_prepare_cmd drivers/scsi/scsi_lib.c:1565 [inline]
RIP: 0010:scsi_queue_rq+0x2155/0x3020 drivers/scsi/scsi_lib.c:1654
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 98 0c 00 00 48 8b 83 58 02 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <0f> b6 14 11 48 89 c1 83 e1 07 38 ca 7f 08 84 d2 0f 85 53 0c 00 00
RSP: 0018:ffffc90005627580 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801b6bd400 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff84aaad82 RDI: 0000000000000003
RBP: ffff888019670000 R08: 0000000000000001 R09: ffff88801b6bd7c0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801b6bd658 R14: ffff8881341bc000 R15: 0000000000000000
FS:  00007f1d217b3700(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005617bf6e4410 CR3: 000000001f08b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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