diff --git a/clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
index 9eb7edffe6df..bd1a56a1aa05 100644
--- a/clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp
@@ -901,9 +901,10 @@ void CStringChecker::evalCopyCommon(CheckerContext &C,
 
   // If the size is zero, there won't be any actual memory access, so
   // just bind the return value to the destination buffer and return.
-  if (stateZeroSize) {
+  if (stateZeroSize && !stateNonZeroSize) {
     stateZeroSize = stateZeroSize->BindExpr(CE, LCtx, destVal);
     C.addTransition(stateZeroSize);
+    return;
   }
 
   // If the size can be nonzero, we have to check the other arguments.
diff --git a/clang/test/Analysis/bstring.c b/clang/test/Analysis/bstring.c
index 833c917613ed..87c91613a5d5 100644
--- a/clang/test/Analysis/bstring.c
+++ b/clang/test/Analysis/bstring.c
@@ -428,3 +428,13 @@ void bcopy2 () {
 
   bcopy(src, dst, 4); // expected-warning{{overflow}}
 }
+
+void *malloc(size_t);
+void free(void *);
+char radar_11125445_memcopythenlogfirstbyte(const char *input, size_t length) {
+  char *bytes = malloc(sizeof(char) * (length + 1));
+  memcpy(bytes, input, length);
+  char x = bytes[0]; // no warning
+  free(bytes);
+  return x;
+}