diff --git a/compiler-rt/lib/asan/asan_malloc_linux.cc b/compiler-rt/lib/asan/asan_malloc_linux.cc
index d7a22d6839a9..a78767c19f0f 100644
--- a/compiler-rt/lib/asan/asan_malloc_linux.cc
+++ b/compiler-rt/lib/asan/asan_malloc_linux.cc
@@ -79,10 +79,12 @@ INTERCEPTOR(void*, realloc, void *ptr, uptr size) {
     uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
     uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
     void *new_ptr;
-    if (UNLIKELY(!asan_inited))
+    if (UNLIKELY(!asan_inited)) {
       new_ptr = AllocateFromLocalPool(size);
-    else
-      new_ptr = asan_malloc(size, &stack);
+    } else {
+      copy_size = size;
+      new_ptr = asan_malloc(copy_size, &stack);
+    }
     internal_memcpy(new_ptr, ptr, copy_size);
     return new_ptr;
   }
diff --git a/compiler-rt/lib/msan/msan_interceptors.cc b/compiler-rt/lib/msan/msan_interceptors.cc
index 2aeaef49e54e..93b93aec283d 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cc
+++ b/compiler-rt/lib/msan/msan_interceptors.cc
@@ -935,7 +935,13 @@ INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
   if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
     uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
     uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
-    void *new_ptr = AllocateFromLocalPool(size);
+    void *new_ptr;
+    if (UNLIKELY(!msan_inited)) {
+      new_ptr = AllocateFromLocalPool(copy_size);
+    } else {
+      copy_size = size;
+      new_ptr = MsanReallocate(&stack, ptr, copy_size, sizeof(u64), false);
+    }
     internal_memcpy(new_ptr, ptr, copy_size);
     return new_ptr;
   }