[sanitizer] Fix crash on empty strings.

vchigrin · eugenis · commit f79937140d07 · 2021-01-27T13:22:43.000-08:00
Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D95431
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cpp
@@ -356,7 +356,7 @@ void ParseSymbolizePCOutput(const char *str, SymbolizedStack *res) {
       InternalFree(info->function);
       info->function = 0;
     }
-    if (0 == internal_strcmp(info->file, "??")) {
+    if (info->file && 0 == internal_strcmp(info->file, "??")) {
       InternalFree(info->file);
       info->file = 0;
     }

Original file line number	Diff line number	Diff line change
`@@ -356,7 +356,7 @@ void ParseSymbolizePCOutput(const char str, SymbolizedStack res) {`
`356`	`356`	`InternalFree(info->function);`
`357`	`357`	`info->function = 0;`
`358`	`358`	`}`
`359`		`- if (0 == internal_strcmp(info->file, "??")) {`
	`359`	`+ if (info->file && 0 == internal_strcmp(info->file, "??")) {`
`360`	`360`	`InternalFree(info->file);`
`361`	`361`	`info->file = 0;`
`362`	`362`	`}`