linux-kernel - [PATCH 2/2] bpf: sockmap, fix double-free

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Message-ID: <96e7f5e59eacddc5e32abb72b7686c3e9163a410.1526565461.git.gustavo@embeddedor.com>
Date:   Thu, 17 May 2018 09:11:02 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 2/2] bpf: sockmap, fix double-free

`e' is being freed twice.

Fix this by removing one of the kfree() calls.

Addresses-Coverity-ID: 1468983 ("Double free")
Fixes: 81110384441a ("bpf: sockmap, add hash map support")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 kernel/bpf/sockmap.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index 41b41fc..c682669 100644
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -1823,7 +1823,6 @@ static int __sock_map_ctx_update_elem(struct bpf_map *map,
 	write_unlock_bh(&sock->sk_callback_lock);
 	return err;
 out_free:
-	kfree(e);
 	smap_release_sock(psock, sock);
 out_progs:
 	if (verdict)
-- 
2.7.4