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 4D34D3D411F; Wed, 8 Apr 2026 18:29:42 +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=1775672982; cv=none; b=SokfwqaTNXVBF2nMMqsUNTFkl3Ej6/R9CScXkLpYzeBUzSba9kPgLP0h6NF9womhTCHT8E/YCPk9XgkwQQotRxOaIwHp+pvxcV0bEl+NRzLXc3ZeZKJbridlsCuNV4KpYIJSz4A1N1+jqWkNx24CImH2Y93XU63UPvgm3bg0HC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775672982; c=relaxed/simple; bh=nf7Ej7nMZDZ8c61h0Fey7ZTWhlLxvH8hxVcOWsoKnLg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pzuHuk46E8VP8Sz45/Za4ya7HAw0TcWEU4unAgAwPXfNZTvheFbjbf1jgkSIkbv0NVCTWqO3A5/KgPhjZ2nF0vyZeZ5p/mh0Or8oE/qc4PKilNPh2msxXdK3ShlynkeUV5qDqDV48ieznCyWXFle9meN80GS0qPokvOe2hewjCw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cP6ABATq; 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="cP6ABATq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7DBCC19425; Wed, 8 Apr 2026 18:29:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1775672982; bh=nf7Ej7nMZDZ8c61h0Fey7ZTWhlLxvH8hxVcOWsoKnLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cP6ABATqCACWoqB6wnEWy+c3Z+JAZJo915KPXp5GxJAJbKK1d3CUShvBj/NuHuN+K 8Ux0tHSFX+jvlmsYYcIeeU03X7+ECxPKWb5lwqalSaw86P0Qw59pXO8B2SSOn3SWQB WTXW0FBrxjacYp98eFBrDo/3bTALI2AGhRuBhhWk= 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 6.18 056/277] NFC: pn533: bound the UART receive buffer Date: Wed, 8 Apr 2026 20:00:41 +0200 Message-ID: <20260408175935.952140650@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260408175933.836769063@linuxfoundation.org> References: <20260408175933.836769063@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 6.18-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 a081bce61c29f..49c399a571750 100644 --- a/drivers/nfc/pn533/uart.c +++ b/drivers/nfc/pn533/uart.c @@ -211,6 +211,9 @@ static size_t pn532_receive_buf(struct serdev_device *serdev, timer_delete(&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