linux-hardening - [PATCH] scsi: elx: libefc: Prefer kcalloc over open coded arithmetic

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Message-Id: <20210905062448.6587-1-len.baker@gmx.com>
Date:   Sun,  5 Sep 2021 08:24:48 +0200
From:   Len Baker <len.baker@....com>
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:     Len Baker <len.baker@....com>, Kees Cook <keescook@...omium.org>,
        Hannes Reinecke <hare@...e.de>, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: elx: libefc: Prefer kcalloc over open coded arithmetic

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific kcalloc() function instead of the argument
count * size in the kzalloc() function.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Len Baker <len.baker@....com>
---
 drivers/scsi/elx/libefc/efc_fabric.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/elx/libefc/efc_fabric.c b/drivers/scsi/elx/libefc/efc_fabric.c
index d397220d9e54..f9412437ad47 100644
--- a/drivers/scsi/elx/libefc/efc_fabric.c
+++ b/drivers/scsi/elx/libefc/efc_fabric.c
@@ -686,7 +686,7 @@ efc_process_gidpt_payload(struct efc_node *node,
 	}

 	/* Allocate a buffer for all nodes */
-	active_nodes = kzalloc(port_count * sizeof(*active_nodes), GFP_ATOMIC);
+	active_nodes = kcalloc(port_count, sizeof(*active_nodes), GFP_ATOMIC);
 	if (!active_nodes) {
 		node_printf(node, "efc_malloc failed\n");
 		return -EIO;
--
2.25.1