migration: check length directly to make sure the range is aligned

Since the start addr is already checked, to make sure the range is
aligned, checking the length is enough.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190712032704.7826-1-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/exec.c b/exec.c
index a34c348184..dfe2096d4a 100644
--- a/exec.c
+++ b/exec.c
@@ -3901,10 +3901,9 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
 
     if ((start + length) <= rb->used_length) {
         bool need_madvise, need_fallocate;
-        uint8_t *host_endaddr = host_startaddr + length;
-        if ((uintptr_t)host_endaddr & (rb->page_size - 1)) {
-            error_report("ram_block_discard_range: Unaligned end address: %p",
-                         host_endaddr);
+        if (length & (rb->page_size - 1)) {
+            error_report("ram_block_discard_range: Unaligned length: %zx",
+                         length);
             goto err;
         }