diff options
| -rw-r--r-- | drivers/char/mem.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 1dc99ab15845..94c2b556cf97 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -733,14 +733,20 @@ static ssize_t read_zero(struct file *file, char __user *buf, while (count) { size_t chunk = min_t(size_t, count, PAGE_SIZE); + size_t left; - if (clear_user(buf + cleared, chunk)) - return cleared ? cleared : -EFAULT; + left = clear_user(buf + cleared, chunk); + if (unlikely(left)) { + cleared += (chunk - left); + if (!cleared) + return -EFAULT; + break; + } cleared += chunk; count -= chunk; if (signal_pending(current)) - return cleared ? cleared : -ERESTARTSYS; + break; cond_resched(); } |