From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Sat, 7 Oct 2023 11:52:39 +0300
Subject: ceph: fix type promotion bug on 32bit systems
Git-commit: 07bb00ef00ace88dd6f695fadbba76565756e55c
Patch-mainline: v6.6-rc6
References: bsc#1216324

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>
Acked-by: Luís Henriques <lhenriques@suse.de>

---
 fs/ceph/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index b1da02f5dbe3..b5f8038065d7 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2969,7 +2969,7 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
 		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;
 		}