linux-kernel - [PATCH] scsi: elx: efct: Avoid open coded arithmetic in memory allocation

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Message-Id: <09772a4478dae212604459a32b68337f7dc1f902.1658467368.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 22 Jul 2022 07:24:03 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     James Smart <james.smart@...adcom.com>,
        Ram Vegesna <ram.vegesna@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org
Subject: [PATCH] scsi: elx: efct: Avoid open coded arithmetic in memory allocation

kmalloc_array()/kcalloc() should be used to avoid potential overflow when
a multiplication is needed to compute the size of the requested memory.

So turn a kzalloc()+explicit size computation into an equivalent kcalloc().

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Discussion about it at:
   https://lore.kernel.org/all/eab847fe-8d17-1a38-b55e-e68a2f6a1829@linux-m68k.org/
---
 drivers/scsi/elx/efct/efct_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/elx/efct/efct_io.c b/drivers/scsi/elx/efct/efct_io.c
index c612f0a48839..1ae2e4e950ef 100644
--- a/drivers/scsi/elx/efct/efct_io.c
+++ b/drivers/scsi/elx/efct/efct_io.c
@@ -56,7 +56,7 @@ efct_io_pool_create(struct efct *efct, u32 num_sgl)
 		}
 
 		/* Allocate SGL */
-		io->sgl = kzalloc(sizeof(*io->sgl) * num_sgl, GFP_KERNEL);
+		io->sgl = kcalloc(num_sgl, sizeof(*io->sgl), GFP_KERNEL);
 		if (!io->sgl) {
 			efct_io_pool_free(io_pool);
 			return NULL;
-- 
2.34.1