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From: coverity-bot <keescook@chromium.org>
To: James Smart <jsmart2021@gmail.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
	Dick Kennedy <dick.kennedy@broadcom.com>,
	James Smart <james.smart@broadcom.com>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	linux-next@vger.kernel.org
Subject: Coverity: lpfc_get_scsi_buf_s3(): Null pointer dereferences
Date: Mon, 4 Nov 2019 09:43:00 -0800
Message-ID: <201911040943.283EF15C4A@keescook> (raw)

Hello!

This is an experimental automated report about issues detected by Coverity
from a scan of next-20191031 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:

2a5b7d626ed2 ("scsi: lpfc: Limit tracking of tgt queue depth in fast path")

Coverity reported the following:

*** CID 1487391:  Null pointer dereferences  (FORWARD_NULL)
/drivers/scsi/lpfc/lpfc_scsi.c: 614 in lpfc_get_scsi_buf_s3()
608     		spin_unlock(&phba->scsi_buf_list_put_lock);
609     	}
610     	spin_unlock_irqrestore(&phba->scsi_buf_list_get_lock, iflag);
611
612     	if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
613     		atomic_inc(&ndlp->cmd_pending);
vvv     CID 1487391:  Null pointer dereferences  (FORWARD_NULL)
vvv     Dereferencing null pointer "lpfc_cmd".
614     		lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
615     	}
616     	return  lpfc_cmd;
617     }
618     /**
619      * lpfc_get_scsi_buf_s4 - Get a scsi buffer from io_buf_list of the HBA

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487391 ("Null pointer dereferences")
Fixes: 2a5b7d626ed2 ("scsi: lpfc: Limit tracking of tgt queue depth in fast path")


Thanks for your attention!

-- 
Coverity-bot

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