From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 428F828ED for ; Mon, 12 Dec 2022 13:24:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4F5EC433F1; Mon, 12 Dec 2022 13:24:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670851462; bh=QW3JLtWtebeWyR+qmY4YSJWk8Xz3aEdIbYmshlfscwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r4vDGFDEC5nAK8S/8zpRaa6SIlM+RR11SqFYA2PRUIgO1S+75RAarDnubLXU7OzhW OSkpbDHgk/05omkWyLb/KtckVfP9igNfgONrm031jSBFgHzZWFj3O25D2uSYYY4wZ4 Fhu6SHevMmgEcF8cQIYytyVB1wDF2TlXuuUiOloE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Artem Chernyshev , Vladimir Oltean , Florian Fainelli , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 43/67] net: dsa: ksz: Check return value Date: Mon, 12 Dec 2022 14:17:18 +0100 Message-Id: <20221212130919.682816667@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130917.599345531@linuxfoundation.org> References: <20221212130917.599345531@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Artem Chernyshev [ Upstream commit 3d8fdcbf1f42e2bb9ae8b8c0b6f202278c788a22 ] Return NULL if we got unexpected value from skb_trim_rcsum() in ksz_common_rcv() Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: bafe9ba7d908 ("net: dsa: ksz: Factor out common tag code") Signed-off-by: Artem Chernyshev Reviewed-by: Vladimir Oltean Reviewed-by: Florian Fainelli Link: https://lore.kernel.org/r/20221201140032.26746-1-artem.chernyshev@red-soft.ru Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/dsa/tag_ksz.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index 73605bcbb385..7354c5db3a14 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -62,7 +62,8 @@ static struct sk_buff *ksz_common_rcv(struct sk_buff *skb, if (!skb->dev) return NULL; - pskb_trim_rcsum(skb, skb->len - len); + if (pskb_trim_rcsum(skb, skb->len - len)) + return NULL; skb->offload_fwd_mark = true; -- 2.35.1