linux-kernel - Re: [PATCH 110/190] Revert "scsi: qla4xxx: fix a potential NULL pointer dereference"

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Date:   Tue, 27 Apr 2021 19:20:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>,
        Manish Rangankar <mrangankar@...vell.com>,
        Mukesh Ojha <mojha@...eaurora.org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 110/190] Revert "scsi: qla4xxx: fix a potential NULL
 pointer dereference"

On Wed, Apr 21, 2021 at 02:59:45PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit fba1bdd2a9a93f3e2181ec1936a3c2f6b37e7ed6.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Manish Rangankar <mrangankar@...vell.com>
> Cc: Mukesh Ojha <mojha@...eaurora.org>
> Cc: Martin K. Petersen <martin.petersen@...cle.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/scsi/qla4xxx/ql4_os.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
> index 7bd9a4a04ad5..5cb0dfe7a83b 100644
> --- a/drivers/scsi/qla4xxx/ql4_os.c
> +++ b/drivers/scsi/qla4xxx/ql4_os.c
> @@ -3229,8 +3229,6 @@ static int qla4xxx_conn_bind(struct iscsi_cls_session *cls_session,
>  	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
>  		return -EINVAL;
>  	ep = iscsi_lookup_endpoint(transport_fd);
> -	if (!ep)
> -		return -EINVAL;
>  	conn = cls_conn->dd_data;
>  	qla_conn = conn->dd_data;
>  	qla_conn->qla_ep = ep->dd_data;
> -- 
> 2.31.1
> 

Looks to be correct.  Odd that you do not have to "unbind" after calling
iscsi_conn_bind(), but hey, it's scsi functions, they are always odd :)

I'll drop this revert.

greg k-h