test_firmware: Use correct snprintf() limit

The limit here is supposed to be how much of the page is left, but it's
just using PAGE_SIZE as the limit.

The other thing to remember is that snprintf() returns the number of
bytes which would have been copied if we had had enough room.  So that
means that if we run out of space then this code would end up passing a
negative value as the limit and the kernel would print an error message.
I have change the code to use scnprintf() which returns the number of
bytes that were successfully printed (not counting the NUL terminator).

Fixes: c92316bf8e94 ("test_firmware: add batched firmware tests")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index 7222093ee00beeffb3a09317466cc1da4cc0c669..b5487ed829d773cc302feb1d264c5f49febda325 100644 (file)
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -223,30 +223,30 @@ static ssize_t config_show(struct device *dev,
 
        mutex_lock(&test_fw_mutex);
 
-       len += snprintf(buf, PAGE_SIZE,
+       len += scnprintf(buf, PAGE_SIZE - len,
                        "Custom trigger configuration for: %s\n",
                        dev_name(dev));
 
        if (test_fw_config->name)
-               len += snprintf(buf+len, PAGE_SIZE,
+               len += scnprintf(buf+len, PAGE_SIZE - len,
                                "name:\t%s\n",
                                test_fw_config->name);
        else
-               len += snprintf(buf+len, PAGE_SIZE,
+               len += scnprintf(buf+len, PAGE_SIZE - len,
                                "name:\tEMTPY\n");
 
-       len += snprintf(buf+len, PAGE_SIZE,
+       len += scnprintf(buf+len, PAGE_SIZE - len,
                        "num_requests:\t%u\n", test_fw_config->num_requests);
 
-       len += snprintf(buf+len, PAGE_SIZE,
+       len += scnprintf(buf+len, PAGE_SIZE - len,
                        "send_uevent:\t\t%s\n",
                        test_fw_config->send_uevent ?
                        "FW_ACTION_HOTPLUG" :
                        "FW_ACTION_NOHOTPLUG");
-       len += snprintf(buf+len, PAGE_SIZE,
+       len += scnprintf(buf+len, PAGE_SIZE - len,
                        "sync_direct:\t\t%s\n",
                        test_fw_config->sync_direct ? "true" : "false");
-       len += snprintf(buf+len, PAGE_SIZE,
+       len += scnprintf(buf+len, PAGE_SIZE - len,
                        "read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
 
        mutex_unlock(&test_fw_mutex);