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path: root/drivers/isdn/isdnloop
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Diffstat (limited to 'drivers/isdn/isdnloop')
-rw-r--r--drivers/isdn/isdnloop/isdnloop.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index 23afba46433..c3ae2edaf6f 100644
--- 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;
}