linux-kernel - [PATCH] net/netfilter: use memset avoid infoleaks

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Message-Id: <20220301081824.2053310-1-chi.minghao@zte.com.cn>
Date:   Tue,  1 Mar 2022 08:18:24 +0000
From:   cgel.zte@...il.com
To:     pablo@...filter.org
Cc:     kadlec@...filter.org, fw@...len.de, davem@...emloft.net,
        kuba@...nel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] net/netfilter: use memset avoid infoleaks

From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>

Use memset to initialize structs to preventing infoleaks
in __bpf_mt_check_bytecode

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 net/netfilter/xt_bpf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/xt_bpf.c b/net/netfilter/xt_bpf.c
index 849ac552a154..5750a68a2a3f 100644
--- a/net/netfilter/xt_bpf.c
+++ b/net/netfilter/xt_bpf.c
@@ -29,6 +29,7 @@ static int __bpf_mt_check_bytecode(struct sock_filter *insns, __u16 len,
 	if (len > XT_BPF_MAX_NUM_INSTR)
 		return -EINVAL;
 
+	memset(&program, 0x0, sizeof(program));
 	program.len = len;
 	program.filter = insns;
 
-- 
2.25.1