From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Sat, 10 Jul 2010 22:10:42 +0000 Subject: [patch] hostap: fixup strlen() math Message-Id: <20100710221042.GA14911@bicker> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Jouni Malinen Cc: "John W. Linville" , Martin Decky , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, kernel-janitors@vger.kernel.org In hostap_add_interface() we do: sprintf(dev->name, "%s%s", prefix, name); dev->name has IFNAMSIZ (16) characters. prefix is local->dev->name. name is "wds%d" strlen() returns the number of characters in the string not counting the NULL so if we have a string with 11 characters we get "12345678901wds%d" which is 16 characters and a NULL so we're past the end of the array. Signed-off-by: Dan Carpenter diff --git a/drivers/net/wireless/hostap/hostap_main.c b/drivers/net/wireless/hostap/hostap_main.c index eb57d1e..f1bc258 100644 --- a/drivers/net/wireless/hostap/hostap_main.c +++ b/drivers/net/wireless/hostap/hostap_main.c @@ -186,7 +186,7 @@ int prism2_wds_add(local_info_t *local, u8 *remote_addr, return -ENOBUFS; /* verify that there is room for wds# postfix in the interface name */ - if (strlen(local->dev->name) > IFNAMSIZ - 5) { + if (strlen(local->dev->name) >= IFNAMSIZ - 5) { printk(KERN_DEBUG "'%s' too long base device name\n", local->dev->name); return -EINVAL;