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[124.44.9.134]) by smtp.gmail.com with ESMTPSA id t6-v6sm10796978pgp.3.2018.06.22.19.08.25 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 22 Jun 2018 19:08:25 -0700 (PDT) From: Stafford Horne To: LKML Cc: Greg KH , arnd@arndb.de, linux-crypto@vger.kernel.org, Stafford Horne Subject: [RFC PATCH 2/2] kobject: Fix -Wstringop-truncation warning Date: Sat, 23 Jun 2018 11:07:53 +0900 Message-Id: <20180623020753.27266-3-shorne@gmail.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180623020753.27266-1-shorne@gmail.com> References: <20180623020753.27266-1-shorne@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When compiling with GCC 9.0.0 I am seeing the following warning: In function ‘fill_kobj_path’, inlined from ‘kobject_get_path’ at lib/kobject.c:155:2: lib/kobject.c:128:3: warning: ‘strncpy’ output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation] strncpy(path + length, kobject_name(parent), cur); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/kobject.c: In function ‘kobject_get_path’: lib/kobject.c:125:13: note: length computed here int cur = strlen(kobject_name(parent)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is pointing out a bug that the strncpy limit is the source string not the destination buffer remaining length. Fix it. Cc: Greg Kroah-Hartman Cc: Arnd Bergmann Signed-off-by: Stafford Horne --- lib/kobject.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/kobject.c b/lib/kobject.c index 18989b5b3b56..15338e5a96f2 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -125,7 +125,7 @@ static void fill_kobj_path(struct kobject *kobj, char *path, int length) int cur = strlen(kobject_name(parent)); /* back up enough to print this name with '/' */ length -= cur; - strncpy(path + length, kobject_name(parent), cur); + strncpy(path + length, kobject_name(parent), length); *(path + --length) = '/'; } -- 2.17.0