diff --git a/kernel/base/include/los_vm_map.h b/kernel/base/include/los_vm_map.h
index 3ebd7570..da099c69 100755
--- a/kernel/base/include/los_vm_map.h
+++ b/kernel/base/include/los_vm_map.h
@@ -240,7 +240,6 @@ STATIC INLINE BOOL LOS_IsUserAddressRange(VADDR_T vaddr, size_t len)
     return (vaddr + len > vaddr) && LOS_IsUserAddress(vaddr) && (LOS_IsUserAddress(vaddr + len - 1));
 }
 
-
 STATIC INLINE BOOL LOS_IsVmallocAddress(VADDR_T vaddr)
 {
     return ((vaddr >= VMALLOC_START) &&
diff --git a/kernel/base/vm/los_vm_map.c b/kernel/base/vm/los_vm_map.c
index 244bf877..c4271ab0 100755
--- a/kernel/base/vm/los_vm_map.c
+++ b/kernel/base/vm/los_vm_map.c
@@ -365,7 +365,7 @@ VADDR_T OsAllocRange(LosVmSpace *vmSpace, size_t len)
             if (nextStart < curEnd) {
                 continue;
             }
-            if ((nextStart - curEnd) >= len) {
+            if ((curEnd + len) <= nextStart) {
                 return curEnd;
             } else {
                 curEnd = curRegion->range.base + curRegion->range.size;
@@ -379,7 +379,7 @@ VADDR_T OsAllocRange(LosVmSpace *vmSpace, size_t len)
             if (nextStart < curEnd) {
                 continue;
             }
-            if ((nextStart - curEnd) >= len) {
+            if ((curEnd + len) <= nextStart) {
                 return curEnd;
             } else {
                 curEnd = curRegion->range.base + curRegion->range.size;
@@ -388,7 +388,7 @@ VADDR_T OsAllocRange(LosVmSpace *vmSpace, size_t len)
     }
 
     nextStart = vmSpace->mapBase + vmSpace->mapSize;
-    if ((nextStart - curEnd) >= len) {
+    if ((curEnd + len) <= nextStart) {
         return curEnd;
     }
 
diff --git a/kernel/extended/dynload/src/los_load_elf.c b/kernel/extended/dynload/src/los_load_elf.c
index 2d02b04a..8602d73a 100755
--- a/kernel/extended/dynload/src/los_load_elf.c
+++ b/kernel/extended/dynload/src/los_load_elf.c
@@ -983,6 +983,7 @@ STATIC VOID OsFlushAspace(ELFLoadInfo *loadInfo)
     processCB->vmSpace->heapBase += OsGetRndOffset(loadInfo);
     processCB->vmSpace->heapNow = processCB->vmSpace->heapBase;
     processCB->vmSpace->mapBase += OsGetRndOffset(loadInfo);
+    processCB->vmSpace->mapSize = loadInfo->stackBase - processCB->vmSpace->mapBase;
     LOS_ArchMmuContextSwitch(&OsCurrProcessGet()->vmSpace->archMmu);
 }