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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: akpm@linux-foundation.org
Cc: dmitry.torokhov@gmail.com, keescook@chromium.org,
	jeyu@redhat.com, rusty@rustcorp.com.au, mmarek@suse.com,
	pmladek@suse.com, mbenes@suse.cz, jpoimboe@redhat.com,
	ebiederm@xmission.com, shuah@kernel.org,
	dan.carpenter@oracle.com, colin.king@canonical.com,
	dcb314@hotmail.com, linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: [PATCH 3/5] test_kmod: fix bug which allows negative values on two config options
Date: Wed,  2 Aug 2017 14:14:48 -0700
Message-ID: <20170802211450.27928-4-mcgrof@kernel.org> (raw)
In-Reply-To: <20170802211450.27928-1-mcgrof@kernel.org>

Parsing with kstrtol() enables values to be negative, and we failed
to check for negative values when parsing with either
test_dev_config_update_uint_sync() or
test_dev_config_update_uint_range().

test_dev_config_update_uint_range() has a minimum check though so an
issue is not present there. test_dev_config_update_uint_sync() is only
used for the number of threads to use (config_num_threads_store()),
and indeed this would fail with an attempt for a large allocation.

Although the issue is only present in practice with the first fix
both by using kstrtoul() instead of kstrtol().

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 39258f448d71 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 lib/test_kmod.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index 90c91541fc16..8fc0a7a19c83 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -880,10 +880,10 @@ static int test_dev_config_update_uint_sync(struct kmod_test_device *test_dev,
 					    int (*test_sync)(struct kmod_test_device *test_dev))
 {
 	int ret;
-	long new;
+	unsigned long new;
 	unsigned int old_val;
 
-	ret = kstrtol(buf, 10, &new);
+	ret = kstrtoul(buf, 10, &new);
 	if (ret)
 		return ret;
 
@@ -918,9 +918,9 @@ static int test_dev_config_update_uint_range(struct kmod_test_device *test_dev,
 					     unsigned int max)
 {
 	int ret;
-	long new;
+	unsigned long new;
 
-	ret = kstrtol(buf, 10, &new);
+	ret = kstrtoul(buf, 10, &new);
 	if (ret)
 		return ret;
 
-- 
2.11.0

  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-02 21:14 [PATCH 0/5] test_kmod: fixes for v4.13-final Luis R. Rodriguez
2017-08-02 21:14 ` [PATCH 1/5] test_kmod: make selftest executable Luis R. Rodriguez
2017-08-02 22:43   ` Andrew Morton
2017-08-02 22:55     ` Luis R. Rodriguez
2017-08-02 23:42       ` Andrew Morton
2017-08-02 23:46         ` Luis R. Rodriguez
2017-08-03  0:01         ` Shuah Khan
2017-08-02 23:57       ` Shuah Khan
2017-08-08  9:50     ` Michael Ellerman
2017-08-08 17:52       ` Luis R. Rodriguez
2017-08-02 21:14 ` [PATCH 2/5] test_kmod: fix spelling mistake: "EMTPY" -> "EMPTY" Luis R. Rodriguez
2017-08-02 21:14 ` Luis R. Rodriguez [this message]
2017-08-02 21:14 ` [PATCH 4/5] test_kmod: fix the lock in register_test_dev_kmod() Luis R. Rodriguez
2017-08-02 21:14 ` [PATCH 5/5] test_kmod: fix small memory leak on filesystem tests Luis R. Rodriguez

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