linux-kernel - Re: [PATCH V3] scsi: lpfc: Fix a possible null pointer dereference

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Date: Thu, 20 Jun 2024 09:43:34 -0700
From: Justin Tee <justintee8345@...il.com>
To: Huai-Yuan Liu <qq810974084@...il.com>
Cc: Justin Tee <justin.tee@...adcom.com>, james.smart@...adcom.com, 
	dick.kennedy@...adcom.com, James.Bottomley@...senpartnership.com, 
	martin.petersen@...cle.com, linux-scsi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, baijiaju1990@...il.com
Subject: Re: [PATCH V3] scsi: lpfc: Fix a possible null pointer dereference

Hi Huai-Yuan,

Sorry for noticing this later, but a return len while len is 0 would
result in a silent $(cat /sys/class/scsi_host/host*/lpfc_xcvr_data).

Perhaps, it's better to log something to at least notify the user why
SFP information was not able to be collected.

How about something like this?

        /* Get transceiver information */
        rdp_context = kmalloc(sizeof(*rdp_context), GFP_KERNEL);
+       if (!rdp_context) {
+               len = scnprintf(buf, PAGE_SIZE - len,
+                                       "SFP info NA: alloc failure\n");
+               return len;
+       }

        rc = lpfc_get_sfp_info_wait(phba, rdp_context);
        if (rc) {


Thanks,
Justin Tee