linux-kernel - [PATCH] usb: iowarrior: replace kmalloc with kmalloc

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Message-ID: <20180823173125.GA24762@embeddedor.com>
Date:   Thu, 23 Aug 2018 12:31:25 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] usb: iowarrior: replace kmalloc with kmalloc_array

A common flaw in the kernel is integer overflow during memory allocation
size calculations. In an effort to reduce the frequency of these bugs,
kmalloc_array was implemented, which allocates memory for an array,
while at the same time detects integer overflow.

This patch replaces cases of:

kmalloc(a * b, gfp)

with:
	kmalloc_array(a * b, gfp)

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/usb/misc/iowarrior.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index c2991b8..7a22400 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -808,7 +808,7 @@ static int iowarrior_probe(struct usb_interface *interface,
 			 dev->int_in_endpoint->bInterval);
 	/* create an internal buffer for interrupt data from the device */
 	dev->read_queue =
-	    kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
+	    kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
 		    GFP_KERNEL);
 	if (!dev->read_queue)
 		goto error;
-- 
2.7.4