linux-kernel - [PATCH 5.10 190/663] media: atomisp: Fix a buffer overflow in debug code

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Date:   Mon,  1 Mar 2021 17:07:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 190/663] media: atomisp: Fix a buffer overflow in debug code

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 625993166b551d633917ca35d4afb7b46d7451b4 ]

The "pad" variable is a user controlled string and we haven't properly
clamped it at this point so the debug code could print from beyond the
of the array.

Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../media/atomisp/pci/atomisp_subdev.c        | 24 ++++++++++++-------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_subdev.c b/drivers/staging/media/atomisp/pci/atomisp_subdev.c
index 52b9fb18c87f0..dcc2dd981ca60 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_subdev.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_subdev.c
@@ -349,12 +349,20 @@ static int isp_subdev_get_selection(struct v4l2_subdev *sd,
 	return 0;
 }
 
-static char *atomisp_pad_str[] = { "ATOMISP_SUBDEV_PAD_SINK",
-				   "ATOMISP_SUBDEV_PAD_SOURCE_CAPTURE",
-				   "ATOMISP_SUBDEV_PAD_SOURCE_VF",
-				   "ATOMISP_SUBDEV_PAD_SOURCE_PREVIEW",
-				   "ATOMISP_SUBDEV_PAD_SOURCE_VIDEO"
-				 };
+static const char *atomisp_pad_str(unsigned int pad)
+{
+	static const char *const pad_str[] = {
+		"ATOMISP_SUBDEV_PAD_SINK",
+		"ATOMISP_SUBDEV_PAD_SOURCE_CAPTURE",
+		"ATOMISP_SUBDEV_PAD_SOURCE_VF",
+		"ATOMISP_SUBDEV_PAD_SOURCE_PREVIEW",
+		"ATOMISP_SUBDEV_PAD_SOURCE_VIDEO",
+	};
+
+	if (pad >= ARRAY_SIZE(pad_str))
+		return "ATOMISP_INVALID_PAD";
+	return pad_str[pad];
+}
 
 int atomisp_subdev_set_selection(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_pad_config *cfg,
@@ -378,7 +386,7 @@ int atomisp_subdev_set_selection(struct v4l2_subdev *sd,
 
 	dev_dbg(isp->dev,
 		"sel: pad %s tgt %s l %d t %d w %d h %d which %s f 0x%8.8x\n",
-		atomisp_pad_str[pad], target == V4L2_SEL_TGT_CROP
+		atomisp_pad_str(pad), target == V4L2_SEL_TGT_CROP
 		? "V4L2_SEL_TGT_CROP" : "V4L2_SEL_TGT_COMPOSE",
 		r->left, r->top, r->width, r->height,
 		which == V4L2_SUBDEV_FORMAT_TRY ? "V4L2_SUBDEV_FORMAT_TRY"
@@ -612,7 +620,7 @@ void atomisp_subdev_set_ffmt(struct v4l2_subdev *sd,
 	enum atomisp_input_stream_id stream_id;
 
 	dev_dbg(isp->dev, "ffmt: pad %s w %d h %d code 0x%8.8x which %s\n",
-		atomisp_pad_str[pad], ffmt->width, ffmt->height, ffmt->code,
+		atomisp_pad_str(pad), ffmt->width, ffmt->height, ffmt->code,
 		which == V4L2_SUBDEV_FORMAT_TRY ? "V4L2_SUBDEV_FORMAT_TRY"
 		: "V4L2_SUBDEV_FORMAT_ACTIVE");
 
-- 
2.27.0