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 D2F1045BE3; Wed, 8 Apr 2026 18:15:05 +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=1775672105; cv=none; b=R0nhCvLB5m/6FORZBcT547VIgJW1Ung7QKyEX7WMwKgbOO2AaDojsg98lIH3pGTpuOJ0PX1eqJqUBSlKeDhEMzjI3GfaquF8KIS2ox6MNtNm/ajN6czyQ56YT1iilvPAZAsaaLIkdg75taIg4av9RD/bNONUfOkM3Jdl4J2seFQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775672105; c=relaxed/simple; bh=yZ6pygGsWDq7pB/danmuMt+VB+YIAN5Q2+XHNM9LCm4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ka09NtIJNVeOdd9zLVF1CnYHCtArwJF4Rhi8FZlCDHt+GYvDleLhcjsSgSmkuMgv7ikYxFvX/phDO8legQ3fLAaay94Ei8fhQD9ONiQLsmkQgPJDZbRgnRASYkiXtumNNn4ph5nudN3lrPTwcrcZcizUQXwSBSc8suSFMO3IVqs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oTFdkfrf; 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="oTFdkfrf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63289C19421; Wed, 8 Apr 2026 18:15:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1775672105; bh=yZ6pygGsWDq7pB/danmuMt+VB+YIAN5Q2+XHNM9LCm4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oTFdkfrfogFUIG04vTlggCTsVbSMWLpee4TisuWHMH/1ujkBI1nMJ7xJ9KTYXl11o vYsH2os2nOGdOjaYtMe5QBKY9iql5UkjrkhkXFD8gPnVlD0S9oNnS94DQZJ/eBqjSi GzdwyxZfr6DG6F0flwi2RnFgqnpQCRPDokif5x1U= 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 6.1 159/312] NFC: pn533: bound the UART receive buffer Date: Wed, 8 Apr 2026 20:01:16 +0200 Message-ID: <20260408175939.704218160@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260408175933.715315542@linuxfoundation.org> References: <20260408175933.715315542@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 6.1-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 07596bf5f7d6d..026d5ef825b59 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