4 files changed, 10 insertions, 5 deletions
diff --git a/libc/stdlib/malloc-standard/free.c b/libc/stdlib/malloc-standard/free.c
index 39e54d635..8b7a81fca 100644
--- a/libc/stdlib/malloc-standard/free.c
+++ b/libc/stdlib/malloc-standard/free.c
@@ -104,9 +104,13 @@ static int __malloc_trim(size_t pad, mstate av)
 */
 int malloc_trim(size_t pad)
 {
+  int r;
+  __MALLOC_LOCK;
   mstate av = get_malloc_state();
   __malloc_consolidate(av);
-  return __malloc_trim(pad, av);
+  r = __malloc_trim(pad, av);
+  __MALLOC_UNLOCK;
+  return r;
 }
 
 /*
diff --git a/libc/stdlib/malloc-standard/malloc.c b/libc/stdlib/malloc-standard/malloc.c
index 2abb5bbdd..fd33b50c7 100644
--- a/libc/stdlib/malloc-standard/malloc.c
+++ b/libc/stdlib/malloc-standard/malloc.c
@@ -832,8 +832,6 @@ void* malloc(size_t bytes)
     }
 #endif
 
-    __MALLOC_LOCK;
-    av = get_malloc_state();
     /*
        Convert request size to internal form by adding (sizeof(size_t)) bytes
        overhead plus possibly more to obtain necessary alignment and/or
@@ -845,6 +843,9 @@ void* malloc(size_t bytes)
 
     checked_request2size(bytes, nb);
 
+    __MALLOC_LOCK;
+    av = get_malloc_state();
+
     /*
        Bypass search if no frees yet
        */
diff --git a/libc/stdlib/malloc-standard/memalign.c b/libc/stdlib/malloc-standard/memalign.c
index 6303c1dd9..e9ae5a7b9 100644
--- a/libc/stdlib/malloc-standard/memalign.c
+++ b/libc/stdlib/malloc-standard/memalign.c
@@ -52,8 +52,8 @@ void* memalign(size_t alignment, size_t bytes)
 	alignment = a;
     }
 
-    __MALLOC_LOCK;
     checked_request2size(bytes, nb);
+    __MALLOC_LOCK;
 
     /* Strategy: find a spot within that chunk that meets the alignment
      * request, and then possibly free the leading and trailing space.  */
diff --git a/libc/stdlib/malloc-standard/realloc.c b/libc/stdlib/malloc-standard/realloc.c
index e060b70ea..e49d11125 100644
--- a/libc/stdlib/malloc-standard/realloc.c
+++ b/libc/stdlib/malloc-standard/realloc.c
@@ -54,9 +54,9 @@ void* realloc(void* oldmem, size_t bytes)
 	return NULL;
     }
 
+    checked_request2size(bytes, nb);
     __MALLOC_LOCK;
     av = get_malloc_state();
-    checked_request2size(bytes, nb);
 
     oldp    = mem2chunk(oldmem);
     oldsize = chunksize(oldp);