1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/vm/brk.c b/kernel/vm/brk.c
index 69a315f..37bd16c 100644
--- a/kernel/vm/brk.c
+++ b/kernel/vm/brk.c
@@ -63,7 +63,7 @@ long do_brk(void *addr, void **ret)
     }
 
     // Check if the address is within the valid range
-    if ((uintptr_t)addr > USER_MEM_HIGH)
+    if ((uintptr_t)addr > USER_MEM_HIGH || (uintptr_t)addr < USER_MEM_LOW)
     {
         return -ENOMEM;
     }
@@ -154,4 +154,4 @@ long do_brk(void *addr, void **ret)
     curproc->p_brk = addr;
     *ret = addr;
     return 0;
-}
+}
+\ No newline at end of file