Commit 0c6dda7a authored Jan 26, 2018 by Darrick J. Wong

iomap: warn on zero-length mappings



Don't let the iomap callback get away with feeding us a garbage zero
length mapping -- there was a bug in xfs that resulted in those leaking
out to hilarious effect.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

parent 4b4c1326

fs/iomap.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -65,6 +65,8 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
		return ret;
		if (WARN_ON(iomap.offset > pos))
		return -EIO;
		if (WARN_ON(iomap.length == 0))
		return -EIO;

		/*
		* Cut down the length to the one actually provided by the filesystem,