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authorEliad Peller <eliad@wizery.com>2012-03-14 18:15:02 +0400
committerJohn W. Linville <linville@tuxdriver.com>2012-03-15 21:40:34 +0400
commitada577c12f7cd8851c999a9f19f62df06df7c39a (patch)
treedb55e957f411c7e95d054b53e23ab561f9ad8f84 /net/mac80211/debugfs_netdev.c
parentba6fa29c6dd51a1245a109f4b460092b51cad0f0 (diff)
downloadlinux-ada577c12f7cd8851c999a9f19f62df06df7c39a.tar.xz
mac80211: add NULL terminator to debugfs_netdev write buf
Some debugfs write functions call kstrto* functions, which assume the string is null-terminated. Make it valid by changing ieee80211_if_write() to use static buffer instead of allocating one, and set the last char to NULL. (The write functions try to parse some integer/mac address, so 64 bytes buffer should be enough) Signed-off-by: Eliad Peller <eliad@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/debugfs_netdev.c')
-rw-r--r--net/mac80211/debugfs_netdev.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index f6de8a65f402..ef5cf2685657 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -49,16 +49,15 @@ static ssize_t ieee80211_if_write(
size_t count, loff_t *ppos,
ssize_t (*write)(struct ieee80211_sub_if_data *, const char *, int))
{
- u8 *buf;
+ char buf[64];
ssize_t ret;
- buf = kmalloc(count, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ if (count >= sizeof(buf))
+ return -E2BIG;
- ret = -EFAULT;
if (copy_from_user(buf, userbuf, count))
- goto freebuf;
+ return -EFAULT;
+ buf[count] = '\0';
ret = -ENODEV;
rtnl_lock();
@@ -66,8 +65,6 @@ static ssize_t ieee80211_if_write(
ret = (*write)(sdata, buf, count);
rtnl_unlock();
-freebuf:
- kfree(buf);
return ret;
}