linux-kernel - [PATCH 07/26] scsi: fnic: use array

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Message-Id: <20230623211457.102544-8-Julia.Lawall@inria.fr>
Date:   Fri, 23 Jun 2023 23:14:38 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Satish Kharat <satishkh@...co.com>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        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>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 07/26] scsi: fnic: use array_size

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/scsi/fnic/fnic_trace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/fnic/fnic_trace.c b/drivers/scsi/fnic/fnic_trace.c
index f3c3a26a1384..74d428c9f7d3 100644
--- a/drivers/scsi/fnic/fnic_trace.c
+++ b/drivers/scsi/fnic/fnic_trace.c
@@ -465,7 +465,7 @@ int fnic_trace_buf_init(void)
 	fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
 					  FNIC_ENTRY_SIZE_BYTES;
 
-	fnic_trace_buf_p = (unsigned long)vzalloc(trace_max_pages * PAGE_SIZE);
+	fnic_trace_buf_p = (unsigned long)vzalloc(array_size(trace_max_pages, PAGE_SIZE));
 	if (!fnic_trace_buf_p) {
 		printk(KERN_ERR PFX "Failed to allocate memory "
 				  "for fnic_trace_buf_p\n");