linux-kernel - [PATCH] mtd: phram: error handling

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Date:	Sun,  8 Nov 2015 14:17:20 +0530
From:	Saurabh Sengar <saurabh.truth@...il.com>
To:	joern@...ybastard.org, dwmw2@...radead.org,
	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	Saurabh Sengar <saurabh.truth@...il.com>
Subject: [PATCH] mtd: phram: error handling

registering the device with NULL pointer can lead to crash,
hence fixing it.

Signed-off-by: Saurabh Sengar <saurabh.truth@...il.com>
---
in case of 'illegal start address' or 'illegal device length', name pointer is getting freed.
we shouldn't register the device with NULL pointer. 

 drivers/mtd/devices/phram.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index 8b66e52..9a7aed3 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -249,12 +249,14 @@ static int phram_setup(const char *val)
 	if (ret) {
 		kfree(name);
 		parse_err("illegal start address\n");
+		goto err;
 	}
 
 	ret = parse_num64(&len, token[2]);
 	if (ret) {
 		kfree(name);
 		parse_err("illegal device length\n");
+		goto err;
 	}
 
 	ret = register_device(name, start, len);
@@ -262,7 +264,7 @@ static int phram_setup(const char *val)
 		pr_info("%s device: %#llx at %#llx\n", name, len, start);
 	else
 		kfree(name);
-
+err:
 	return ret;
 }
 
-- 
1.9.1

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