[PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Dan Carpenter]

The "axchg" pointer is dereferenced when we call the
lpfc_nvme_unsol_ls_issue_abort() function.  It can't be either freed or
NULL.

Fixes: 3a8070c567aa ("lpfc: Refactor NVME LS receive handling")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
---
Resending to the NVMe list.  Added James' R-b.

Is there a way we could update MAINTAINERS so that ./get_maintainer.pl
send these to the correct list?

 drivers/scsi/lpfc/lpfc_sli.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 38889cb6e1996..fcf51b4192d66 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -2895,14 +2895,14 @@ lpfc_nvme_unsol_ls_handler(struct lpfc_hba *phba, struct lpfc_iocbq *piocb)
 			(phba->nvmet_support) ? "T" : "I", ret);
 
 out_fail:
-	kfree(axchg);
-
 	/* recycle receive buffer */
 	lpfc_in_buf_free(phba, &nvmebuf->dbuf);
 
 	/* If start of new exchange, abort it */
-	if (fctl & FC_FC_FIRST_SEQ && !(fctl & FC_FC_EX_CTX))
+	if (axchg && (fctl & FC_FC_FIRST_SEQ) && !(fctl & FC_FC_EX_CTX))
 		lpfc_nvme_unsol_ls_issue_abort(phba, axchg, sid, oxid);
+
+	kfree(axchg);
 }
 
 /**
-- 
2.26.2

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Christoph Hellwig]

James, can you review this patch?

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Dan Carpenter]

On Wed, May 20, 2020 at 09:55:57AM -0700, Christoph Hellwig wrote:
> James, can you review this patch?

He already reviewed it in a different thread.  I copied his R-b tag.

regards,
dan carpenter

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Christoph Hellwig]

On Wed, May 20, 2020 at 08:24:33PM +0300, Dan Carpenter wrote:
> On Wed, May 20, 2020 at 09:55:57AM -0700, Christoph Hellwig wrote:
> > James, can you review this patch?
> 
> He already reviewed it in a different thread.  I copied his R-b tag.

James, should this go into the nvme or scsi tree?

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Martin K. Petersen]

Christoph,

> On Wed, May 20, 2020 at 08:24:33PM +0300, Dan Carpenter wrote:
>> On Wed, May 20, 2020 at 09:55:57AM -0700, Christoph Hellwig wrote:
>> > James, can you review this patch?
>> 
>> He already reviewed it in a different thread.  I copied his R-b tag.
>
> James, should this go into the nvme or scsi tree?

The offending patch is in the nvme tree so I think you should take
it. Otherwise I'll pick it up in 5.8/scsi-fixes.

-- 
Martin K. Petersen	Oracle Linux Engineering

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Christoph Hellwig]

On Wed, May 20, 2020 at 01:33:12PM -0400, Martin K. Petersen wrote:
> 
> Christoph,
> 
> > On Wed, May 20, 2020 at 08:24:33PM +0300, Dan Carpenter wrote:
> >> On Wed, May 20, 2020 at 09:55:57AM -0700, Christoph Hellwig wrote:
> >> > James, can you review this patch?
> >> 
> >> He already reviewed it in a different thread.  I copied his R-b tag.
> >
> > James, should this go into the nvme or scsi tree?
> 
> The offending patch is in the nvme tree so I think you should take
> it. Otherwise I'll pick it up in 5.8/scsi-fixes.

I'll pick it up.  Can you give me an ACK for it to show Jens you are
ok with that?

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Martin K. Petersen]

Christoph,

> I'll pick it up.  Can you give me an ACK for it to show Jens you are
> ok with that?

Acked-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Christoph Hellwig]

On Wed, May 20, 2020 at 01:39:55PM -0400, Martin K. Petersen wrote:
> 
> Christoph,
> 
> > I'll pick it up.  Can you give me an ACK for it to show Jens you are
> > ok with that?
> 
> Acked-by: Martin K. Petersen <martin.petersen@oracle.com>

Thanks,

applied to nvme-5.8.

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[James Smart]

On 5/20/2020 10:48 AM, Christoph Hellwig wrote:
> On Wed, May 20, 2020 at 01:39:55PM -0400, Martin K. Petersen wrote:
>> Christoph,
>>
>>> I'll pick it up.  Can you give me an ACK for it to show Jens you are
>>> ok with that?
>> Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
> Thanks,
>
> applied to nvme-5.8.

Guess you didn't see Dan's response - we had replied, and Dick rejected 
it. Dick has created a new patch that I'll be posting shortly.

-- james



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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Christoph Hellwig]

On Wed, May 20, 2020 at 10:51:48AM -0700, James Smart wrote:
> On 5/20/2020 10:48 AM, Christoph Hellwig wrote:
> > On Wed, May 20, 2020 at 01:39:55PM -0400, Martin K. Petersen wrote:
> > > Christoph,
> > > 
> > > > I'll pick it up.  Can you give me an ACK for it to show Jens you are
> > > > ok with that?
> > > Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
> > Thanks,
> > 
> > applied to nvme-5.8.
> 
> Guess you didn't see Dan's response - we had replied, and Dick rejected it.
> Dick has created a new patch that I'll be posting shortly.

Oh well, I'll pull it again then.

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Re: [PATCH resend] scsi: lpfc: Fix a use after free in lpfc_nvme_unsol_ls_handler()

[Dan Carpenter]

On Wed, May 20, 2020 at 10:51:48AM -0700, James Smart wrote:
> On 5/20/2020 10:48 AM, Christoph Hellwig wrote:
> > On Wed, May 20, 2020 at 01:39:55PM -0400, Martin K. Petersen wrote:
> > > Christoph,
> > > 
> > > > I'll pick it up.  Can you give me an ACK for it to show Jens you are
> > > > ok with that?
> > > Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
> > Thanks,
> > 
> > applied to nvme-5.8.
> 
> Guess you didn't see Dan's response - we had replied, and Dick rejected it.
> Dick has created a new patch that I'll be posting shortly.

Gar....  I'm sorry I have two mail boxes, one for kernel-janitors and
one for my own email address.  I guess his email never made it to the
lists.  I did get it on my other email box though.

regards,
dan carpenter


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