Commit 2c5773f1 authored Oct 30, 2018 by Darrick J. Wong Committed by Dave Chinner Oct 30, 2018

vfs: exit early from zero length remap operations



If a remap caller asks us to remap to the source file's EOF and the
source file length leaves us with a zero byte request, exit early.

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

parent 1383a7ed

fs/read_write.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1748,6 +1748,8 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in,
		if (pos_in > isize)
		return -EINVAL;
		*len = isize - pos_in;
		if (*len == 0)
		return 0;
		}

		/* Check that we don't violate system file offset limits. */