[PATCH 6.1 105/131] ceph: fix type promotion bug on 32bit systems

Greg Kroah-Hartman
2023-10-16T09:02:40Z

From: Dan Carpenter <dan.carpenter@linaro.org>

commit 07bb00ef00ace88dd6f695fadbba76565756e55c upstream.

In this code "ret" is type long and "src_objlen" is unsigned int. The
problem is that on 32bit systems, when we do the comparison signed longs
are type promoted to unsigned int. So negative error codes from
do_splice_direct() are treated as success instead of failure.

Cc: stable@vger.kernel.org
Fixes: 1b0c3b9f91f0 ("ceph: re-org copy_file_range and fix some error paths")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ceph/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2498,7 +2498,7 @@ static ssize_t __ceph_copy_file_range(st
ret = do_splice_direct(src_file, &src_off, dst_file,
&dst_off, src_objlen, flags);
/* Abort on short copies or on error */
- if (ret < src_objlen) {
+ if (ret < (long)src_objlen) {
dout("Failed partial copy (%zd)\n", ret);
goto out;
}