[PATCH] ISDN: check for userspace copy faults

[pandora-kernel.git] / drivers / isdn / isdnloop / isdnloop.c

diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index 23afba4..c3ae2ed 100644 (file)
--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -446,7 +446,8 @@ isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
        for (p = buf, count = 0; count < len; p++, count++) {
                if (card->msg_buf_read == card->msg_buf_write)
                        return count;
-               put_user(*card->msg_buf_read++, p);
+               if (put_user(*card->msg_buf_read++, p))
+                       return -EFAULT;
                if (card->msg_buf_read > card->msg_buf_end)
                        card->msg_buf_read = card->msg_buf;
        }