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

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Date:   Mon, 15 Jun 2020 17:54:28 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Satish Kharat <satishkh@...co.com>,
        Sesidhar Baddela <sebaddel@...co.com>,
        Karan Tilak Kumar <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-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH][next] scsi: fnic: Replace vmalloc() + memset() with
 vzalloc() and use array_size()

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