b43: debugfs SHM read buffer overrun fix

Fix possible buffer overrun.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c
index 734e70e..ef0075d 100644 (file)
--- a/drivers/net/wireless/b43/debugfs.c
+++ b/drivers/net/wireless/b43/debugfs.c
@@ -128,7 +128,7 @@ static ssize_t shm_read_file(struct b43_wldev *dev,
        __le16 *le16buf = (__le16 *)buf;
 
        for (i = 0; i < 0x1000; i++) {
-               if (bufsize <= 0)
+               if (bufsize < sizeof(tmp))
                        break;
                tmp = b43_shm_read16(dev, B43_SHM_SHARED, 2 * i);
                le16buf[i] = cpu_to_le16(tmp);