[PATCH] perf expr: Fix missing check for return value of hashmap__new

[Miaoqian Lin]

The hashmap__new() function may return ERR_PTR(-ENOMEM) when malloc
fails, add IS_ERR checking for ctx->ids.

Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
---
 tools/perf/util/expr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index 1d532b9fed29..c94c9ea30d1a 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -299,6 +299,10 @@ struct expr_parse_ctx *expr__ctx_new(void)
 		return NULL;
 
 	ctx->ids = hashmap__new(key_hash, key_equal, NULL);
+	if (IS_ERR(ctx->ids)) {
+		kfree(ctx);
+		return NULL;
+	}
 	ctx->runtime = 0;
 
 	return ctx;
-- 
2.17.1