Fix crash in String when using nullptr (#10971)

TD-er · web-flow · commit ee94c5c089ed · 2025-02-15T11:38:32.000+01:00
Fixes: #10971
diff --git a/cores/esp32/WString.cpp b/cores/esp32/WString.cpp
@@ -290,7 +290,8 @@ String &String::operator=(StringSumHelper &&rval) {
 #endif
 
 String &String::operator=(const char *cstr) {
-  return copy(cstr, strlen(cstr));
+  const uint32_t length = cstr ? strlen(cstr) : 0u;
+  return copy(cstr, length);
 }
 
 /*********************************************/

Original file line number	Diff line number	Diff line change
`@@ -290,7 +290,8 @@ String &String::operator=(StringSumHelper &&rval) {`
`290`	`290`	`#endif`
`291`	`291`
`292`	`292`	`String &String::operator=(const char *cstr) {`
`293`		`- return copy(cstr, strlen(cstr));`
	`293`	`+ const uint32_t length = cstr ? strlen(cstr) : 0u;`
	`294`	`+ return copy(cstr, length);`
`294`	`295`	`}`
`295`	`296`
`296`	`297`	`/*********************************************/`