[Qemu-devel] [PULL 07/29] memory: fix off-by-one error in memory_region_notify_one()

[Paolo Bonzini <pbonzini@redhat.com>]

From: Maxime Coquelin <maxime.coquelin@redhat.com>

This patch fixes an off-by-one error that could lead to the
notifyee to receive notifications for ranges it is not
registered to.

The bug has been spotted by code review.

Fixes: bd2bfa4c52e5 ("memory: introduce memory_region_notify_one()")
Cc: qemu-stable@nongnu.org
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20171010094247.10173-4-maxime.coquelin@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/memory.c b/memory.c
index 5e6351a..b637c12 100644
--- a/memory.c
+++ b/memory.c
@@ -1892,7 +1892,7 @@ void memory_region_notify_one(IOMMUNotifier *notifier,
      * Skip the notification if the notification does not overlap
      * with registered range.
      */
-    if (notifier->start > entry->iova + entry->addr_mask + 1 ||
+    if (notifier->start > entry->iova + entry->addr_mask ||
         notifier->end < entry->iova) {
         return;
     }
-- 
1.8.3.1