linux-kernel - [PATCH 1/5] mtd: block2mtd: Check for valid user supplied erase size

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Date:   Fri,  2 Jun 2017 17:43:38 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Joern Engel <joern@...ybastard.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Artem Bityutskiy <dedekind1@...il.com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 1/5] mtd: block2mtd: Check for valid user supplied erase size

Erase size is limited to 32bit unsigned integer, but value parsed from user
is limited up to size_t C type.

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/mtd/devices/block2mtd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index 7c887f1..ee47cdd 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -419,7 +419,7 @@ static int block2mtd_setup2(const char *val)
 
 	if (token[1]) {
 		ret = parse_num(&erase_size, token[1]);
-		if (ret) {
+		if (ret || erase_size > U32_MAX) {
 			pr_err("illegal erase size\n");
 			return 0;
 		}
-- 
1.7.9.5