linux-kernel - [PATCH 2/2] lib/bpf hashmap: fixes to hashmap_

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Message-Id: <20200506205257.8964-3-irogers@google.com>
Date:   Wed,  6 May 2020 13:52:57 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH 2/2] lib/bpf hashmap: fixes to hashmap__clear

hashmap_find_entry assumes that if buckets is NULL then there are no
entries. NULL the buckets in clear to ensure this.
Free hashmap entries and not just the bucket array.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/lib/bpf/hashmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/lib/bpf/hashmap.c b/tools/lib/bpf/hashmap.c
index 54c30c802070..1a1bca1ff5cd 100644
--- a/tools/lib/bpf/hashmap.c
+++ b/tools/lib/bpf/hashmap.c
@@ -59,7 +59,13 @@ struct hashmap *hashmap__new(hashmap_hash_fn hash_fn,
 
 void hashmap__clear(struct hashmap *map)
 {
+	struct hashmap_entry *cur, *tmp;
+	size_t bkt;
+
+	hashmap__for_each_entry_safe(map, cur, tmp, bkt)
+		free(cur);
 	free(map->buckets);
+	map->buckets = NULL;
 	map->cap = map->cap_bits = map->sz = 0;
 }
 
-- 
2.26.2.526.g744177e7f7-goog