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ceph: fix type promotion bug on 32bit systems

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commit 07bb00ef00 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: 1b0c3b9f91 ("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>
This commit is contained in:
Dan Carpenter 2023-10-07 11:52:39 +03:00 committed by Greg Kroah-Hartman
parent c0c4acd53a
commit 6ad7f52d8c
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/file.c
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@ -2436,7 +2436,7 @@ 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;
}