linux-kernel - Re: [PATCH][next] scsi: fnic: Replace vmalloc() + memset() with vzalloc() and use array

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Date:   Tue, 16 Jun 2020 00:19:49 +0000
From:   "Satish Kharat (satishkh)" <satishkh@...co.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        "Sesidhar Baddela (sebaddel)" <sebaddel@...co.com>,
        "Karan Tilak Kumar (kartilak)" <kartilak@...co.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] scsi: fnic: Replace vmalloc() + memset() with
 vzalloc() and use array_size()

Reviewed-by: Satish Kharat <satishkh@...co.com>


On 6/15/20, 3:49 PM, "Gustavo A. R. Silva" <gustavoars@...nel.org> wrote:

    Use vzalloc() instead of the vmalloc() and memset. Also, use array_size()
    instead of the open-coded version.
    
    This issue was found with the help of Coccinelle and, audited and fixed
    manually.
    
    Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
    Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
    ---
     drivers/scsi/fnic/fnic_trace.c | 16 ++++------------
     1 file changed, 4 insertions(+), 12 deletions(-)
    
    diff --git a/drivers/scsi/fnic/fnic_trace.c b/drivers/scsi/fnic/fnic_trace.c
    index 9d52d83161ed..be266d1611bb 100644
    --- a/drivers/scsi/fnic/fnic_trace.c
    +++ b/drivers/scsi/fnic/fnic_trace.c
    @@ -488,7 +488,7 @@ int fnic_trace_buf_init(void)
     	}
     
     	fnic_trace_entries.page_offset =
    -		vmalloc(array_size(fnic_max_trace_entries,
    +		vzalloc(array_size(fnic_max_trace_entries,
     				   sizeof(unsigned long)));
     	if (!fnic_trace_entries.page_offset) {
     		printk(KERN_ERR PFX "Failed to allocate memory for"
    @@ -500,8 +500,6 @@ int fnic_trace_buf_init(void)
     		err = -ENOMEM;
     		goto err_fnic_trace_buf_init;
     	}
    -	memset((void *)fnic_trace_entries.page_offset, 0,
    -		  (fnic_max_trace_entries * sizeof(unsigned long)));
     	fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
     	fnic_buf_head = fnic_trace_buf_p;
     
    @@ -559,10 +557,10 @@ int fnic_fc_trace_init(void)
     	int err = 0;
     	int i;
     
    -	fc_trace_max_entries = (fnic_fc_trace_max_pages * PAGE_SIZE)/
    +	fc_trace_max_entries = array_size(fnic_fc_trace_max_pages, PAGE_SIZE)/
     				FC_TRC_SIZE_BYTES;
     	fnic_fc_ctlr_trace_buf_p =
    -		(unsigned long)vmalloc(array_size(PAGE_SIZE,
    +		(unsigned long)vzalloc(array_size(PAGE_SIZE,
     						  fnic_fc_trace_max_pages));
     	if (!fnic_fc_ctlr_trace_buf_p) {
     		pr_err("fnic: Failed to allocate memory for "
    @@ -571,12 +569,9 @@ int fnic_fc_trace_init(void)
     		goto err_fnic_fc_ctlr_trace_buf_init;
     	}
     
    -	memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
    -			fnic_fc_trace_max_pages * PAGE_SIZE);
    -
     	/* Allocate memory for page offset */
     	fc_trace_entries.page_offset =
    -		vmalloc(array_size(fc_trace_max_entries,
    +		vzalloc(array_size(fc_trace_max_entries,
     				   sizeof(unsigned long)));
     	if (!fc_trace_entries.page_offset) {
     		pr_err("fnic:Failed to allocate memory for page_offset\n");
    @@ -588,9 +583,6 @@ int fnic_fc_trace_init(void)
     		err = -ENOMEM;
     		goto err_fnic_fc_ctlr_trace_buf_init;
     	}
    -	memset((void *)fc_trace_entries.page_offset, 0,
    -	       (fc_trace_max_entries * sizeof(unsigned long)));
    -
     	fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
     	fc_trace_buf_head = fnic_fc_ctlr_trace_buf_p;
     
    -- 
    2.27.0