From: Dan Carpenter <error27@gmail.com>
To: Jouni Malinen <j@w1.fi>
Cc: "John W. Linville" <linville@tuxdriver.com>,
Martin Decky <martin@decky.cz>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [patch] hostap: fixup strlen() math
Date: Sun, 11 Jul 2010 00:10:42 +0200 [thread overview]
Message-ID: <20100710221042.GA14911@bicker> (raw)
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 <error27@gmail.com>
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;
reply other threads:[~2010-07-10 22:19 UTC|newest]
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