copy_oldmem_kernel() - WRITE is "data source", not destination

JIRA: https://issues.redhat.com/browse/RHEL-32199

Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit 0e1e4a2
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Thu Sep 15 18:55:18 2022 -0400

    [s390] copy_oldmem_kernel() - WRITE is "data source", not destination

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Baoquan He <bhe@redhat.com>

Author: Baoquan He

arch/s390/kernel/crash_dump.c

@@ -153,7 +153,7 @@ int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
 
 	kvec.iov_base = dst;
 	kvec.iov_len = count;
-	iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
+	iov_iter_kvec(&iter, READ, &kvec, 1, count);
 	if (copy_oldmem_iter(&iter, src, count) < count)
 		return -EFAULT;
 	return 0;