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 146C6313298; Mon, 13 Apr 2026 16:35:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776098154; cv=none; b=u0VVZDTTWYGR4LIB3JReAzZ0naef76kOIR44MVdJUo5DZs234kGXn9YX80MdQbctONXyauFHtBByg4eCYXjZ8AWxJiytjVeTtWQIwDRIZzikYRZzPYbcJNFsIx/4VoDQ3dfzlDpKEmcWNt+xwCHSdK9vwBo2NYRDivp4ZUt1++Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776098154; c=relaxed/simple; bh=a37JlJ//onUta125/zCb/4sgcPMjLpDoAX+TXmmfD78=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LaLjOMjysyyFRSax6RxMeEB8Tg6Q/YTt9dgjnBh67RcTr77FI9UUk3c+2uAnADsFqgiDV7JNzC5WegUNAk8nbNToJG/Aw8jPX9M2IW9tORR0Kj5RqQ68z2FbmvBnQCB/fYPiGiy3ErEcFyXES0ktTgHNAjHxo50BdGCUQRg+7VE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZaFLH4aX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZaFLH4aX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31FD4C2BCB0; Mon, 13 Apr 2026 16:35:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776098153; bh=a37JlJ//onUta125/zCb/4sgcPMjLpDoAX+TXmmfD78=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZaFLH4aX0pJr93UEh1n1t6JoOj1J9NAGh5dWkVyYfphBnB/jn2iCjV1Ka9pqAz9a3 i1K62LsriEFkLqfTyTlpqlmjjX6/zR+zvNgnFi7rHpL0QVLQ5ehXl9GsFJDKYym5zi mKYE6dYi/t9Bni27bXDFvWNarVXw934kNVrIQzh8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pengpeng Hou , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 415/570] NFC: pn533: bound the UART receive buffer Date: Mon, 13 Apr 2026 17:59:06 +0200 Message-ID: <20260413155846.019354991@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Pengpeng Hou [ Upstream commit 30fe3f5f6494f827d812ff179f295a8e532709d6 ] pn532_receive_buf() appends every incoming byte to dev->recv_skb and only resets the buffer after pn532_uart_rx_is_frame() recognizes a complete frame. A continuous stream of bytes without a valid PN532 frame header therefore keeps growing the skb until skb_put_u8() hits the tail limit. Drop the accumulated partial frame once the fixed receive buffer is full so malformed UART traffic cannot grow the skb past PN532_UART_SKB_BUFF_LEN. Fixes: c656aa4c27b1 ("nfc: pn533: add UART phy driver") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260326142033.82297-1-pengpeng@iscas.ac.cn Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/nfc/pn533/uart.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/nfc/pn533/uart.c b/drivers/nfc/pn533/uart.c index 7ad98973648cc..615ceff0adeee 100644 --- a/drivers/nfc/pn533/uart.c +++ b/drivers/nfc/pn533/uart.c @@ -211,6 +211,9 @@ static int pn532_receive_buf(struct serdev_device *serdev, del_timer(&dev->cmd_timeout); for (i = 0; i < count; i++) { + if (unlikely(!skb_tailroom(dev->recv_skb))) + skb_trim(dev->recv_skb, 0); + skb_put_u8(dev->recv_skb, *data++); if (!pn532_uart_rx_is_frame(dev->recv_skb)) continue; -- 2.53.0