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test_firmware: Use correct snprintf() limit

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commit bd17cc5a20ae9aaa3ed775f360b75ff93cd66a1d upstream.

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: c92316bf8e ("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>
This commit is contained in:
Dan Carpenter 2019-05-15 12:33:22 +03:00 committed by Greg Kroah-Hartman
parent 67bdeb0c6f
commit 7fbcb7d103
1 changed files with 7 additions and 7 deletions
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14
lib/test_firmware.c
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@ -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);