diff --git a/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
--- a/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
@@ -126,6 +126,11 @@
       // Size overflow check does not work with symbolic expressions because a
       // overflow situation can not be detected easily.
       uint64_t IndexL = IndexLVal->getZExtValue();
+      // constraints are not solved for expressions with multiple
+      // symbols, so just bail on invalid indices at this point.
+      if (IndexL <= 0)
+        return nullptr;
+
       assert(IndexL > 0 && "Index length should have been checked for zero.");
       if (KnownSize <= SizeMax / IndexL) {
         KnownSize *= IndexL;
diff --git a/clang/test/Analysis/vla.c b/clang/test/Analysis/vla.c
--- a/clang/test/Analysis/vla.c
+++ b/clang/test/Analysis/vla.c
@@ -137,3 +137,17 @@
   clang_analyzer_eval(clang_analyzer_getExtent(&vla3m) == 2 * x * 4 * sizeof(int));
   // expected-warning@-1{{TRUE}}
 }
+
+// https://bugs.llvm.org/show_bug.cgi?id=46128
+// analyzer doesn't handle more than simple symmmmbolic expressions.
+// Just don't crash.
+extern void foo(void);
+int a;
+void b() {
+  int c = a + 1;
+  for (;;) {
+    int d[c];
+    for (; 0 < c;)
+      foo();
+  }
+} // no-crash