Index: clang/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
@@ -514,7 +514,7 @@
     if (OneOf("snprintf"))
       return {{1}, {0, ReturnValueIndex}, VariadicType::Src, 3};
     if (OneOf("sprintf"))
-      return {{}, {0, ReturnValueIndex}, VariadicType::Src, 2};
+      return {{1}, {0, ReturnValueIndex}, VariadicType::Src, 2};
     if (OneOf("strcpy", "stpcpy", "strcat"))
       return {{1}, {0, ReturnValueIndex}};
     if (OneOf("bcopy"))
Index: clang/test/Analysis/taint-generic.c
===================================================================
--- clang/test/Analysis/taint-generic.c
+++ clang/test/Analysis/taint-generic.c
@@ -341,6 +341,17 @@
     *(volatile int *) 0; // no-warning
 }
 
+int sprintf_is_not_a_source(char *buf) {
+  int x = sprintf(buf, "Covid-%d", 19); // no-warning
+  return 1 / x; // no-warning: 'sprintf' is not a taint source
+}
+
+int sprintf_propagates_taint(char *buf) {
+  int year;
+  scanf("%d", &year);
+  int x = sprintf(buf, "Covid-%d", year); // propagate taint!
+  return 1 / x; // expected-warning {{Division by a tainted value, possibly zero}}
+}
 
 // Test configuration
 int mySource1();