linux-kernel - Re: [PATCH] scsi: Let scsi_execute_cmd() mark args->sshdr as invalid

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Date:   Wed, 17 May 2023 06:54:38 +0200
From:   Juergen Gross <jgross@...e.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH] scsi: Let scsi_execute_cmd() mark args->sshdr as invalid

On 17.05.23 04:06, Martin K. Petersen wrote:
> 
> Juergen,
> 
>> Some callers of scsi_execute_cmd() (like e.g. sd_spinup_disk()) are
>> passing an uninitialized struct sshdr and don't look at the return
>> value of scsi_execute_cmd() before looking at the contents of that
>> struct.
> 
> Which callers? sd_spinup_disk() appears to do the right thing...
> 

Not really. It is calling media_not_present() directly after the call of
scsi_execute_cmd() without checking the result. media_not_present() is looking
at sshdr, which is uninitialized in case of an early error in
scsi_execute_cmd(). The same applies to read_capacity_1[06]().

scsi_test_unit_ready() and scsi_report_lun_scan() have the problem, too.

Do I need to find other examples?


Juergen

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