From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> 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@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> --- fs/read_write.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/read_write.c b/fs/read_write.c index d6e8e242a15f..2456da3f8a41 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -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. */
