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| author | Eliad Peller <eliad@wizery.com> | 2012-03-14 16:15:02 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-03-15 13:40:34 -0400 |
| commit | ada577c12f7cd8851c999a9f19f62df06df7c39a (patch) | |
| tree | db55e957f411c7e95d054b53e23ab561f9ad8f84 /net/mac80211 | |
| parent | ba6fa29c6dd51a1245a109f4b460092b51cad0f0 (diff) | |
| download | linux-stable-ada577c12f7cd8851c999a9f19f62df06df7c39a.tar.gz linux-stable-ada577c12f7cd8851c999a9f19f62df06df7c39a.tar.bz2 linux-stable-ada577c12f7cd8851c999a9f19f62df06df7c39a.zip | |
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')
| -rw-r--r-- | net/mac80211/debugfs_netdev.c | 13 |
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; } |