perf expr: Initialize is_test value in expr__ctx_new()

[ Upstream commit 1d18ebcfd3 ]

When expr_parse_ctx is allocated by expr_ctx_new(),
expr_scanner_ctx->is_test isn't initialize, so it has garbage value.
this can affects the result of expr__parse() return when it parses
non-exist event literal according to garbage value.

Use calloc instead of malloc in expr_ctx_new() to fix this.

Fixes: 3340a08354 ("perf pmu-events: Fix testing with JEVENTS_ARCH=all")
Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Levi Yun <yeoreum.yun@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20241108143424.819126-1-yeoreum.yun@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

tools/perf/util/expr.c

@@ -292,7 +292,7 @@ struct expr_parse_ctx *expr__ctx_new(void)
 {
 	struct expr_parse_ctx *ctx;
 
-	ctx = malloc(sizeof(struct expr_parse_ctx));
+	ctx = calloc(1, sizeof(struct expr_parse_ctx));
 	if (!ctx)
 		return NULL;
 
@@ -301,9 +301,6 @@ struct expr_parse_ctx *expr__ctx_new(void)
 		free(ctx);
 		return NULL;
 	}
-	ctx->sctx.user_requested_cpu_list = NULL;
-	ctx->sctx.runtime = 0;
-	ctx->sctx.system_wide = false;
 
 	return ctx;
 }