From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 170E74252BE; Wed, 23 Sep 2026 14:39:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790174372; cv=none; b=sVH2SgIGSkNKLA0KNN3kQsKPr+0mH+ETJcl8YL1KlKjr2uXk2yEt9YBciOsCLMFfUfRtA7r3vI5fklSdSvVM35xyD3jgT/HKY0QWXcJJ/BPRk82bSvl+w6texfuNuj0p7U8ifYExtyGFGiodPt67ejhyQb6m2+2lUOBTxHDvpgo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790174372; c=relaxed/simple; bh=ji7hFDG4TguAP99MJQycHadRWNVXTwmQT/Nzq0+v5I0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=muvF83yqviPlPtZiShoQV0BF3WCtRXfYNGwvQcyXM8xo6m7Xf2GycjhT9Rere7w4A/T+xPCwm8RsbNmlQHLZ3nMFtqnxx9g9WDD4hO9dTjKSeAj9eo8njyP0RkKycEQy7HQEStm5LatWQJTQQrHVSk1M3SGG2iWBYOr2DOZzFNg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=U6O/MeYp; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="U6O/MeYp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 350B01F000FF; Wed, 23 Sep 2026 14:39:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790174370; bh=YP9MjKwr7/3litlItGB3SvzIHh4gawRM0+vmpFaU7zA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=U6O/MeYpr+W+V3W8GDj4vW0CRHUuUuxu/usnwgV++2gvltOQwhqQYb1mdMNa+j6dV gWz9JvOgEySeSJK9tKjZXUL8eGYis7rnEtIJKhW/GBLT2wTfPu9fonWrxQgBc1f4pc 8IDwVJMVkx9fbHCi9gzMNQtoW71VPq5IHY4DSUcE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Theodor Arsenij Larionov Trichkine , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 6.18 092/398] netfilter: nft_nat: fully initialise new_addr in netmap setup Date: Wed, 23 Sep 2026 16:02:46 +0200 Message-ID: <20260923140645.824238144@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923140643.441954610@linuxfoundation.org> References: <20260923140643.441954610@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Theodor Arsenij Larionov Trichkine [ Upstream commit d313499df66159b4b7971d760d16729598ab7e5a ] nft_nat_setup_netmap() builds the mapped address in an on-stack union nf_inet_addr. For an IPv4 mapping it writes only the 4-byte .ip member and the loop runs a single 32-bit iteration, but it then copies the whole 16-byte union into range->min_addr and range->max_addr, so the upper 12 bytes reach nf_nat_setup_info() uninitialised. KMSAN reports an uninit-value in nf_nat_setup_info() reached from nft_nat_eval(). The IPv6 path fills all 16 bytes and is not affected. Zero-initialise new_addr. Fixes: 3ff7ddb1353d ("netfilter: nft_nat: add netmap support") Signed-off-by: Theodor Arsenij Larionov Trichkine Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nft_nat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c index e32cd9fbc7c2e..cdbd800cac969 100644 --- a/net/netfilter/nft_nat.c +++ b/net/netfilter/nft_nat.c @@ -64,8 +64,8 @@ static void nft_nat_setup_netmap(struct nf_nat_range2 *range, const struct nft_pktinfo *pkt, const struct nft_nat *priv) { + union nf_inet_addr new_addr = {}; struct sk_buff *skb = pkt->skb; - union nf_inet_addr new_addr; __be32 netmask; int i, len = 0; -- 2.53.0