1 files changed, 1 insertions, 0 deletions
diff --git a/exec.c b/exec.c
index 9cbde85d8c..778263f1c6 100644
--- a/exec.c
+++ b/exec.c
@@ -3540,6 +3540,7 @@ void *address_space_map(AddressSpace *as,
 
     if (!memory_access_is_direct(mr, is_write)) {
         if (atomic_xchg(&bounce.in_use, true)) {
+            *plen = 0;
             return NULL;
         }
         /* Avoid unbounded allocations */