Commit 907bfcd8 authored Apr 14, 2017 by Dan Carpenter Committed by Mike Marshall Apr 26, 2017

orangefs: handle zero size write in debugfs

If we write zero bytes to this debugfs file, then it will cause an
underflow when we do copy_from_user(buf, ubuf, count - 1). Debugfs can
normally only be written to by root so the impact of this is low.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

parent b5a9d61e

fs/orangefs/orangefs-debugfs.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -440,6 +440,9 @@ static ssize_t orangefs_debug_write(struct file *file,
		"orangefs_debug_write: %pD\n",
		file);

		if (count == 0)
		return 0;

		/*
		* Thwart users who try to jamb a ridiculous number
		* of bytes into the debug file...