linux-kernel - [PATCH] random: kmalloc failure ignored in init_std

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Date:	Sat, 19 Sep 2009 01:03:53 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] random: kmalloc failure ignored in init_std_data()

Clean up and error out if kmalloc() fails.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
Found with sed: http://kernelnewbies.org/roelkluin

Build tested. Please review

diff --git a/drivers/char/random.c b/drivers/char/random.c
index d8a9255..8a68be8 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -939,7 +939,7 @@ EXPORT_SYMBOL(get_random_bytes);
  * data into the pool to prepare it for use. The pool is not cleared
  * as that can only decrease the entropy in the pool.
  */
-static void init_std_data(struct entropy_store *r)
+static int init_std_data(struct entropy_store *r)
 {
 	ktime_t now;
 	unsigned long flags;
@@ -952,16 +952,35 @@ static void init_std_data(struct entropy_store *r)
 	mix_pool_bytes(r, &now, sizeof(now));
 	mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
 	/* Enable continuous test in fips mode */
-	if (fips_enabled)
+	if (fips_enabled) {
 		r->last_data = kmalloc(EXTRACT_SIZE, GFP_KERNEL);
+		if (r->last_data == NULL)
+			return -ENOMEM;
+	}
+	return 0;
 }
 
 static int rand_initialize(void)
 {
-	init_std_data(&input_pool);
-	init_std_data(&blocking_pool);
-	init_std_data(&nonblocking_pool);
+	int ret;
+	ret = init_std_data(&input_pool);
+	if (ret != 0)
+		return ret;
+
+	ret = init_std_data(&blocking_pool);
+	if (ret != 0)
+		goto free_ip_ld;
+
+	ret = init_std_data(&nonblocking_pool);
+	if (ret != 0)
+		goto free_bp_ld;
+
 	return 0;
+free_bp_ld:
+	kfree(blocking_pool.last_data);
+free_ip_ld:
+	kfree(input_pool.last_data);
+	return ret;
 }
 module_init(rand_initialize);
 
@@ -1160,8 +1179,8 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		/* Clear the entropy pool counters. */
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
-		rand_initialize();
-		return 0;
+		retval = rand_initialize();
+		return retval;
 	default:
 		return -EINVAL;
 	}
--
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