linux-kernel - Re: [PATCH] scsi: qedf: replace memset/memcpy with safer strscpy

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Date:   Fri, 12 Apr 2019 10:23:44 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     YueHaibing <yuehaibing@...wei.com>,
        QLogic-Storage-Upstream@...ium.com,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: qedf: replace memset/memcpy with safer strscpy

On 12/04/2019 10:20, YueHaibing wrote:
> 
> I send a similar fix earlier, but it seems not be picked.

It would be useful to get a fix for this applied as I'm seeing many
multiple of reports of this issue with Coverity and it is a relatively
simple fix.

Colin

> 
> https://patchwork.kernel.org/patch/10874565/
> 
> On 2019/4/12 17:05, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently the qedf_dbg_* family of functions can overrun the end
>> of the source string if it is less than the destination buffer
>> length because of the use of a fixed sized memcpy. Replace the
>> memset/memcpy calls with the safer strscpy as this won't overrun
>> the end of the source string and it ensures the destination
>> string is always terminated with NUL.
>>
>> Addresses-Coverity: ("Out-of-bounds access")
>> Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/scsi/qedf/qedf_dbg.c | 12 ++++--------
>>  1 file changed, 4 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/scsi/qedf/qedf_dbg.c b/drivers/scsi/qedf/qedf_dbg.c
>> index f2397ee9ba69..b491bebeaca9 100644
>> --- a/drivers/scsi/qedf/qedf_dbg.c
>> +++ b/drivers/scsi/qedf/qedf_dbg.c
>> @@ -17,8 +17,7 @@ qedf_dbg_err(struct qedf_dbg_ctx *qedf, const char *func, u32 line,
>>  	struct va_format vaf;
>>  	char nfunc[32];
>>  
>> -	memset(nfunc, 0, sizeof(nfunc));
>> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>> +	strscpy(nfunc, func, sizeof(nfunc));
>>  
>>  	va_start(va, fmt);
>>  
>> @@ -42,8 +41,7 @@ qedf_dbg_warn(struct qedf_dbg_ctx *qedf, const char *func, u32 line,
>>  	struct va_format vaf;
>>  	char nfunc[32];
>>  
>> -	memset(nfunc, 0, sizeof(nfunc));
>> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>> +	strscpy(nfunc, func, sizeof(nfunc));
>>  
>>  	va_start(va, fmt);
>>  
>> @@ -71,8 +69,7 @@ qedf_dbg_notice(struct qedf_dbg_ctx *qedf, const char *func, u32 line,
>>  	struct va_format vaf;
>>  	char nfunc[32];
>>  
>> -	memset(nfunc, 0, sizeof(nfunc));
>> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>> +	strscpy(nfunc, func, sizeof(nfunc));
>>  
>>  	va_start(va, fmt);
>>  
>> @@ -101,8 +98,7 @@ qedf_dbg_info(struct qedf_dbg_ctx *qedf, const char *func, u32 line,
>>  	struct va_format vaf;
>>  	char nfunc[32];
>>  
>> -	memset(nfunc, 0, sizeof(nfunc));
>> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>> +	strscpy(nfunc, func, sizeof(nfunc));
>>  
>>  	va_start(va, fmt);
>>  
>>
>