From patchwork Fri Jan 3 16:35:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 60972 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1inPun-00ASZL-H1; Fri, 03 Jan 2020 16:35:09 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728096AbgACQfi (ORCPT + 1 other); Fri, 3 Jan 2020 11:35:38 -0500 Received: from mail-lj1-f193.google.com ([209.85.208.193]:45524 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728064AbgACQfh (ORCPT ); Fri, 3 Jan 2020 11:35:37 -0500 Received: by mail-lj1-f193.google.com with SMTP id j26so44403262ljc.12; Fri, 03 Jan 2020 08:35:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=fvUvyPauFgb0gSD0dBGAKRr2laNeAtuutqe4RwswNwo=; b=HNkvjSfytuTs2BsFxEvBmoTJbcNYqlO1KkHDd0GLJa1b9Th60vzPBrEKocrypaPFX8 5awHdLZ5FlRU1rr+lyV1tA1HTgwXu8etVZneBbcoxsORI/1QdKxiKqiOLPK0QIZsOtQe WlNzOnSGwUz7i4X/O+ywARE26ke9sxqyHpptdqPHdk/YAB87s0ofD34k7YVBX/iL7+Nb 56AvxYU/TOvtGiXxpB5LinrLY8vNqFD9G3pPETFFh4i+RkjryIjSJr9CSonlZQsffQPY 1+F3e241z1GWaPt/vViKGFrgiYRanmwfqkiDpyutfNUAoRRsGn1sJ0a6WAmCui3sWrPs Iadw== X-Gm-Message-State: APjAAAUqqNpsJJd5SVon3svXFAEIMMTNwhFNNj3tFZt8BIhU47LKqSKP g4l/fns1ei/vJeQpkrKWXMM= X-Google-Smtp-Source: APXvYqw7CC0QU8Touq6DWulQjWAKvYvfvYb2oEEcSrTqdjfy566G+5e/mN2WX3nEvGCEmfRtDY0bTw== X-Received: by 2002:a2e:9592:: with SMTP id w18mr52088640ljh.98.1578069334478; Fri, 03 Jan 2020 08:35:34 -0800 (PST) Received: from xi.terra (c-14b8e655.07-184-6d6c6d4.bbcust.telenor.se. [85.230.184.20]) by smtp.gmail.com with ESMTPSA id r21sm24849749ljn.64.2020.01.03.08.35.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Jan 2020 08:35:32 -0800 (PST) Received: from johan by xi.terra with local (Exim 4.92.3) (envelope-from ) id 1inPvB-0000Kp-6W; Fri, 03 Jan 2020 17:35:33 +0100 From: Johan Hovold To: Mauro Carvalho Chehab Cc: Sean Young , Hans Verkuil , linux-media@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable , Hans de Goede Subject: [PATCH 2/6] media: ov519: add missing endpoint sanity checks Date: Fri, 3 Jan 2020 17:35:09 +0100 Message-Id: <20200103163513.1229-3-johan@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200103163513.1229-1-johan@kernel.org> References: <20200103163513.1229-1-johan@kernel.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Make sure to check that we have at least one endpoint before accessing the endpoint array to avoid dereferencing a NULL-pointer on stream start. Note that these sanity checks are not redundant as the driver is mixing looking up altsettings by index and by number, which need not coincide. Fixes: 1876bb923c98 ("V4L/DVB (12079): gspca_ov519: add support for the ov511 bridge") Fixes: b282d87332f5 ("V4L/DVB (12080): gspca_ov519: Fix ov518+ with OV7620AE (Trust spacecam 320)") Cc: stable # 2.6.31 Cc: Hans de Goede Signed-off-by: Johan Hovold --- drivers/media/usb/gspca/ov519.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/media/usb/gspca/ov519.c b/drivers/media/usb/gspca/ov519.c index f417dfc0b872..0afe70a3f9a2 100644 --- a/drivers/media/usb/gspca/ov519.c +++ b/drivers/media/usb/gspca/ov519.c @@ -3477,6 +3477,11 @@ static void ov511_mode_init_regs(struct sd *sd) return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); reg_w(sd, R51x_FIFO_PSIZE, packet_size >> 5); @@ -3603,6 +3608,11 @@ static void ov518_mode_init_regs(struct sd *sd) return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); ov518_reg_w32(sd, R51x_FIFO_PSIZE, packet_size & ~7, 2);