From patchwork Wed Mar 13 20:43:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 10851723 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1D7356C2 for ; Wed, 13 Mar 2019 20:44:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88CF828796 for ; Wed, 13 Mar 2019 20:44:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7BFCF289CD; Wed, 13 Mar 2019 20:44:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CA69928796 for ; Wed, 13 Mar 2019 20:44:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=JmUu5XaOcGuWE0PT5ce2Mh8nvRdb8qBD+T7MHulWaNs=; b=MNpsQ8Ek4Nr8Ij s1/ZPGRC+rkYtxiZtk0C2v6ir3VyDF22Ej0iIFYMHKxFDwUfdMoTPk8j9zphSJ4LNwdlw3B5ZPFZW /OTwbHP5+eNt19oZyho6J9lhaLtJSod8UYEXBbgMSlf/yo2nRuTRtw+snDiQ5/SLa62EhWX1wY6d7 wymub90XQhzWGURJKQVDAFFjKLDL8bh0ouA6MMmAEHkh40vHXbolSSaNp+GIwiRASa0dk1HuVdKz+ Gnajp+bPoGsG0pYJPbTu/IREp802ybAFggeixM++npzh6p+kmwlz7U8Nn3kmHqeWNQz7qrT6SXHkr EsSR0hB0RQqkVI+T0N9g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h4AjP-0004XD-FM; Wed, 13 Mar 2019 20:44:07 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1h4AjL-0004Wt-PZ for linux-mediatek@lists.infradead.org; Wed, 13 Mar 2019 20:44:05 +0000 X-UUID: 9bbd81bb7603442a84476734d337a33e-20190313 X-UUID: 9bbd81bb7603442a84476734d337a33e-20190313 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1637932576; Wed, 13 Mar 2019 12:44:00 -0800 Received: from MTKMBS01DR.mediatek.inc (172.21.101.111) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 13 Mar 2019 13:43:59 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01dr.mediatek.inc (172.21.101.111) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 14 Mar 2019 04:43:50 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 14 Mar 2019 04:43:50 +0800 From: To: , Subject: [PATCH] Bluetooth: mediatek: fix uninitialized symbol errors in btmtksdio_rx_packet Date: Thu, 14 Mar 2019 04:43:49 +0800 Message-ID: <8fb8e6840a39127112597963d665fbe6c21d8b91.1552509647.git.sean.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190313_134403_836273_E0CEE309 X-CRM114-Status: UNSURE ( 9.78 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-bluetooth@vger.kernel.org, Sean Wang , linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sean Wang Fixed all the below warnings. They would probably cause the following error handling path would use the uninitialized value and then produce unexpected behavior. drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_len’ may be used uninitialized in this function [-Wmaybe-uninitialized] print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ old_data, old_len, true); ~~~~~~~~~~~~~~~~~~~~~~~~ drivers/bluetooth/btmtksdio.c:376:15: note: ‘old_len’ was declared here unsigned int old_len; ^~~~~~~ drivers/bluetooth/btmtksdio.c:470:2: warning: ‘old_data’ may be used uninitialized in this function [-Wmaybe-uninitialized] print_hex_dump(KERN_ERR, "err sdio rx: ", DUMP_PREFIX_NONE, 4, 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ old_data, old_len, true); ~~~~~~~~~~~~~~~~~~~~~~~~ drivers/bluetooth/btmtksdio.c:375:17: note: ‘old_data’ was declared here unsigned char *old_data; ^~~~~~~~ Fixes: d74eef2834b5 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices") Reported-by: Dan Carpenter Reported-by: Marcel Holtmann Signed-off-by: Sean Wang --- drivers/bluetooth/btmtksdio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c index b4b8320f279e..23cf63888bac 100644 --- a/drivers/bluetooth/btmtksdio.c +++ b/drivers/bluetooth/btmtksdio.c @@ -372,8 +372,8 @@ static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size) const struct h4_recv_pkt *pkts = mtk_recv_pkts; int pkts_count = ARRAY_SIZE(mtk_recv_pkts); struct mtkbtsdio_hdr *sdio_hdr; - unsigned char *old_data; - unsigned int old_len; + unsigned char *old_data = NULL; + unsigned int old_len = 0; int err, i, pad_size; struct sk_buff *skb; u16 dlen;