iio: iio_enum_available_read: Prevent possible buffer overflow

Use scnprint instead of snprintf, because snprintf returns the number of bytes
that would have been written to the buffer if there was enough space, and as a
result writing to buf[len-1] might cause a access beyond the buffers limits.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen 2012-06-05 18:24:12 +02:00 committed by Greg Kroah-Hartman
parent a21e6bfeb4
commit 74dcd439bf

View File

@ -300,7 +300,7 @@ ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
return 0; return 0;
for (i = 0; i < e->num_items; ++i) for (i = 0; i < e->num_items; ++i)
len += snprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
/* replace last space with a newline */ /* replace last space with a newline */
buf[len - 1] = '\n'; buf[len - 1] = '\n';