linux-kernel - [PATCH AUTOSEL 5.4 28/29] libbpf: Fix overrun in netlink attribute iteration

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Message-Id: <20221009222304.1218873-28-sashal@kernel.org>
Date:   Sun,  9 Oct 2022 18:23:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xin Liu <liuxin350@...wei.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Sasha Levin <sashal@...nel.org>, ast@...nel.org,
        daniel@...earbox.net, bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 28/29] libbpf: Fix overrun in netlink attribute iteration

From: Xin Liu <liuxin350@...wei.com>

[ Upstream commit 51e05a8cf8eb34da7473823b7f236a77adfef0b4 ]

I accidentally found that a change in commit 1045b03e07d8 ("netlink: fix
overrun in attribute iteration") was not synchronized to the function
`nla_ok` in tools/lib/bpf/nlattr.c, I think it is necessary to modify,
this patch will do it.

Signed-off-by: Xin Liu <liuxin350@...wei.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/20220930090708.62394-1-liuxin350@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/lib/bpf/nlattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/nlattr.c b/tools/lib/bpf/nlattr.c
index 1e69c0c8d413..faa6256d857a 100644
--- a/tools/lib/bpf/nlattr.c
+++ b/tools/lib/bpf/nlattr.c
@@ -31,7 +31,7 @@ static struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
 
 static int nla_ok(const struct nlattr *nla, int remaining)
 {
-	return remaining >= sizeof(*nla) &&
+	return remaining >= (int)sizeof(*nla) &&
 	       nla->nla_len >= sizeof(*nla) &&
 	       nla->nla_len <= remaining;
 }
-- 
2.35.1