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 099AF3D45CB; Tue, 16 Jun 2026 18:22:06 +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=1781634128; cv=none; b=jX9fmIJMQ4Ppo0j1U9zOb0Zq6MD1QeZ8kCoNAJhZqVdIlU/ft9sVZmHtyydReluYOVEGE4RtlA+LaEGp5uO7OZmz3lAaEW6HsmgdN0MUKHlXswbrfb/Rc/sBfGZwymwcM2ZZLZDTzdHhzJffh42F2/OIzhejsHHrtT52yMJr9bc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781634128; c=relaxed/simple; bh=snBSwDDT+SZQnME6+Lhg3dPrQiNb6ipVUCpvN6zhLkA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aUf6Nwioyk2DfL+ifgwXMgZhdc4rME8y9UP01BiRLZx6kQfggVpdy0Azz7dpSgrQsVgn+0fNE+daiIYOlHxl5npcrwp4eP8vYtZzADN3eggenQfH1vMxXokh60GmHL2gdRn5bp+iy60VBGC22xZOP3AIcMaV7FczuldLD2t+nYs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BzBEQFiX; 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="BzBEQFiX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2FEF1F000E9; Tue, 16 Jun 2026 18:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781634126; bh=ZIB2KhVKilm79dO24XOSGGXgHR+hZJaYEvpBPVeneGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BzBEQFiXBraeIFfNadPpgDAmWCGbwqb8kzlfJOgVlQWIsAo/WoBfEX9p2XcjqQkv8 JOadooBfHjkr5Sw5oGGlu6Gac/DPDRtedRnBVkR2Sj4b7JOf6Zzhxp1H079IHczFDV nPofTrAPehuuXLn68T6sxEzv2THcuHhvxApFEDeA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Til Kaiser , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 196/411] net: mvpp2: limit XDP frame size to the RX buffer Date: Tue, 16 Jun 2026 20:27:14 +0530 Message-ID: <20260616145111.138506486@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145100.376842714@linuxfoundation.org> References: <20260616145100.376842714@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Til Kaiser [ Upstream commit f3c6aa078927e6fe8121c9c591ddee8716c5305a ] mvpp2 has short and long BM pools, and short pool buffers can be smaller than PAGE_SIZE. The XDP path nevertheless initializes every xdp_buff with PAGE_SIZE as frame size. XDP helpers use frame_sz to validate tail growth and to derive the hard end of the data area. Advertising PAGE_SIZE for short buffers can let bpf_xdp_adjust_tail() grow a packet past the real allocation, corrupting memory or later tripping skb tailroom checks. Initialize the XDP buffer with bm_pool->frag_size so XDP tailroom matches the actual buffer backing the packet. Fixes: 07dd0a7aae7f ("mvpp2: add basic XDP support") Signed-off-by: Til Kaiser Link: https://patch.msgid.link/20260607134943.21996-3-mail@tk154.de Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index ad6325c80f9868..d8a2268b88187a 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -3978,7 +3978,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, else xdp_rxq = &rxq->xdp_rxq_long; - xdp_init_buff(&xdp, PAGE_SIZE, xdp_rxq); + xdp_init_buff(&xdp, bm_pool->frag_size, xdp_rxq); xdp_prepare_buff(&xdp, data, MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM, rx_bytes, false); -- 2.53.0