[RFC PATCH v3 05/14] perf expr: fix memory leaks in bison

[Ian Rogers]

Add a destructor for strings to reclaim memory in the event of errors.
Free the ID given for a lookup.

Signed-off-by: Ian Rogers <irog...@google.com>
---
 tools/perf/util/expr.y | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index 21e82a1e11a2..3b49b230b111 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -27,6 +27,7 @@
 %token EXPR_PARSE EXPR_OTHER EXPR_ERROR
 %token <num> NUMBER
 %token <str> ID
+%destructor { free ($$); } <str>
 %token MIN MAX IF ELSE SMT_ON
 %left MIN MAX IF
 %left '|'
@@ -94,8 +95,10 @@ if_expr:
 expr:    NUMBER
        | ID                    { if (lookup_id(ctx, $1, &$$) < 0) {
                                        pr_debug("%s not found\n", $1);
+                                       free($1);
                                        YYABORT;
                                  }
+                                 free($1);
                                }
        | expr '|' expr         { $$ = (long)$1 | (long)$3; }
        | expr '&' expr         { $$ = (long)$1 & (long)$3; }
-- 
2.26.2.645.ge9eca65c58-goog