linux-hardening - [PATCH] media: imx-jpeg: Bounds check sizeimage access

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Message-Id: <20230204183804.never.323-kees@kernel.org>
Date:   Sat,  4 Feb 2023 10:38:05 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Mirela Rabulea <mirela.rabulea@....com>
Cc:     Kees Cook <keescook@...omium.org>,
        NXP Linux Team <linux-imx@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] media: imx-jpeg: Bounds check sizeimage access

The call of mxc_jpeg_get_plane_size() from mxc_jpeg_dec_irq() sets
plane_no argument to 1. The compiler sees that it's possible to end up
with an access beyond the bounds of sizeimage, if mem_planes was too
large:

        if (plane_no >= fmt->mem_planes)        // mem_planes = 2+
                return 0;

        if (fmt->mem_planes == fmt->comp_planes) // comp_planes != mem_planes
                return q_data->sizeimage[plane_no];

        if (plane_no < fmt->mem_planes - 1)     // mem_planes = 2
                return q_data->sizeimage[plane_no];

comp_planes == 0 or 1 is safe. comp_planes > 2 would be out of bounds.

(This isn't currently possible given the contents of mxc_formats, though.)

Silence the warning by bounds checking comp_planes for future
robustness. Seen with GCC 13:

In function 'mxc_jpeg_get_plane_size',
    inlined from 'mxc_jpeg_dec_irq' at ../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c:729:14:
../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c:641:42: warning: array subscript 2 is above array bounds of 'u32[2]' {aka 'unsigned int[2]'} [-Warray-bounds=]
  641 |                 size += q_data->sizeimage[i];
      |                         ~~~~~~~~~~~~~~~~~^~~
In file included from ../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h:112,
                 from ../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c:63:
../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.h: In function 'mxc_jpeg_dec_irq':
../drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.h:84:41: note: while referencing 'sizeimage'
   84 |         u32                             sizeimage[MXC_JPEG_MAX_PLANES];
      |                                         ^~~~~~~~~

Cc: Mirela Rabulea <mirela.rabulea@....com>
Cc: NXP Linux Team <linux-imx@....com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
Cc: Fabio Estevam <festevam@...il.com>
Cc: linux-media@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
index 6cd015a35f7c..ac44bf23953a 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
@@ -637,6 +637,11 @@ static u32 mxc_jpeg_get_plane_size(struct mxc_jpeg_q_data *q_data, u32 plane_no)
 		return q_data->sizeimage[plane_no];
 
 	size = q_data->sizeimage[fmt->mem_planes - 1];
+
+	/* Should be impossible given mxc_formats. */
+	if (WARN_ON_ONCE(fmt->comp_planes > ARRAY_SIZE(q_data->sizeimage)))
+		return size;
+
 	for (i = fmt->mem_planes; i < fmt->comp_planes; i++)
 		size += q_data->sizeimage[i];
 
-- 
2.34.1