diff mbox series

[v3,06/10] media: imx: utils: Make imx_media_pixfmt handle variable number of codes

Message ID 20200329174010.12304-7-slongerbeam@gmail.com
State New
Headers show
Series media: imx: Miscellaneous format-related cleanups | expand

Commit Message

Steve Longerbeam March 29, 2020, 5:40 p.m. UTC 
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The imx_media_pixfmt structures includes a codes member that stores
media bus codes as a fixed array of 4 integers. The functions dealing
with the imx_media_pixfmt structures assume that the array of codes is
terminated by a 0 elements. This mechanism is fragile, as demonstrated
by several instances of the structure contained 4 non-zero codes.

Fix this by turning the array into a pointer, and providing an
IMX_BUS_FMTS macro to initialize the codes member with a guaranteed 0
element at the end.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

[Fix a NULL deref when derefencing a NULL cc->codes on return from
 several calls to imx_media_find_format()]
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-media-capture.c |  4 +-
 drivers/staging/media/imx/imx-media-utils.c   | 89 +++++++++++--------
 drivers/staging/media/imx/imx-media.h         |  2 +-
 3 files changed, 54 insertions(+), 41 deletions(-)
diff mbox series

Patch

diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index d60b49ec4fa4..650c53289f6b 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -95,7 +95,7 @@  static int capture_enum_framesizes(struct file *file, void *fh,
 	if (!cc)
 		return -EINVAL;
 
-	fse.code = cc->codes[0];
+	fse.code = cc->codes ? cc->codes[0] : 0;
 
 	ret = v4l2_subdev_call(priv->src_sd, pad, enum_frame_size, NULL, &fse);
 	if (ret)
@@ -137,7 +137,7 @@  static int capture_enum_frameintervals(struct file *file, void *fh,
 	if (!cc)
 		return -EINVAL;
 
-	fie.code = cc->codes[0];
+	fie.code = cc->codes ? cc->codes[0] : 0;
 
 	ret = v4l2_subdev_call(priv->src_sd, pad, enum_frame_interval,
 			       NULL, &fie);
diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
index 981a8b540a3c..ff4f85be6d65 100644
--- a/drivers/staging/media/imx/imx-media-utils.c
+++ b/drivers/staging/media/imx/imx-media-utils.c
@@ -7,6 +7,12 @@ 
 #include <linux/module.h>
 #include "imx-media.h"
 
+#define IMX_BUS_FMTS(fmts...)	\
+	(const u32[]) {		\
+		fmts,		\
+		0		\
+	}
+
 /*
  * List of supported pixel formats for the subdevs.
  */
@@ -14,18 +20,18 @@  static const struct imx_media_pixfmt pixel_formats[] = {
 	/*** YUV formats start here ***/
 	{
 		.fourcc	= V4L2_PIX_FMT_UYVY,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_UYVY8_2X8,
 			MEDIA_BUS_FMT_UYVY8_1X16
-		},
+		),
 		.cs     = IPUV3_COLORSPACE_YUV,
 		.bpp    = 16,
 	}, {
 		.fourcc	= V4L2_PIX_FMT_YUYV,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_YUYV8_2X8,
 			MEDIA_BUS_FMT_YUYV8_1X16
-		},
+		),
 		.cs     = IPUV3_COLORSPACE_YUV,
 		.bpp    = 16,
 	}, {
@@ -57,16 +63,16 @@  static const struct imx_media_pixfmt pixel_formats[] = {
 	/*** RGB formats start here ***/
 	{
 		.fourcc	= V4L2_PIX_FMT_RGB565,
-		.codes  = {MEDIA_BUS_FMT_RGB565_2X8_LE},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_RGB565_2X8_LE),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.cycles = 2,
 	}, {
 		.fourcc	= V4L2_PIX_FMT_RGB24,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_RGB888_1X24,
 			MEDIA_BUS_FMT_RGB888_2X12_LE
-		},
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 24,
 	}, {
@@ -75,7 +81,7 @@  static const struct imx_media_pixfmt pixel_formats[] = {
 		.bpp    = 24,
 	}, {
 		.fourcc	= V4L2_PIX_FMT_XRGB32,
-		.codes  = {MEDIA_BUS_FMT_ARGB8888_1X32},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_ARGB8888_1X32),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 32,
 		.ipufmt = true,
@@ -95,91 +101,91 @@  static const struct imx_media_pixfmt pixel_formats[] = {
 	/*** raw bayer and grayscale formats start here ***/
 	{
 		.fourcc = V4L2_PIX_FMT_SBGGR8,
-		.codes  = {MEDIA_BUS_FMT_SBGGR8_1X8},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_SBGGR8_1X8),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 8,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SGBRG8,
-		.codes  = {MEDIA_BUS_FMT_SGBRG8_1X8},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_SGBRG8_1X8),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 8,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SGRBG8,
-		.codes  = {MEDIA_BUS_FMT_SGRBG8_1X8},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_SGRBG8_1X8),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 8,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SRGGB8,
-		.codes  = {MEDIA_BUS_FMT_SRGGB8_1X8},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_SRGGB8_1X8),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 8,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SBGGR16,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_SBGGR10_1X10,
 			MEDIA_BUS_FMT_SBGGR12_1X12,
 			MEDIA_BUS_FMT_SBGGR14_1X14,
 			MEDIA_BUS_FMT_SBGGR16_1X16
-		},
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SGBRG16,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_SGBRG10_1X10,
 			MEDIA_BUS_FMT_SGBRG12_1X12,
 			MEDIA_BUS_FMT_SGBRG14_1X14,
-			MEDIA_BUS_FMT_SGBRG16_1X16,
-		},
+			MEDIA_BUS_FMT_SGBRG16_1X16
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SGRBG16,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_SGRBG10_1X10,
 			MEDIA_BUS_FMT_SGRBG12_1X12,
 			MEDIA_BUS_FMT_SGRBG14_1X14,
-			MEDIA_BUS_FMT_SGRBG16_1X16,
-		},
+			MEDIA_BUS_FMT_SGRBG16_1X16
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_SRGGB16,
-		.codes  = {
+		.codes  = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_SRGGB10_1X10,
 			MEDIA_BUS_FMT_SRGGB12_1X12,
 			MEDIA_BUS_FMT_SRGGB14_1X14,
-			MEDIA_BUS_FMT_SRGGB16_1X16,
-		},
+			MEDIA_BUS_FMT_SRGGB16_1X16
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_GREY,
-		.codes = {
+		.codes = IMX_BUS_FMTS(
 			MEDIA_BUS_FMT_Y8_1X8,
 			MEDIA_BUS_FMT_Y10_1X10,
-			MEDIA_BUS_FMT_Y12_1X12,
-		},
+			MEDIA_BUS_FMT_Y12_1X12
+		),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 8,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_Y10,
-		.codes = {MEDIA_BUS_FMT_Y10_1X10},
+		.codes = IMX_BUS_FMTS(MEDIA_BUS_FMT_Y10_1X10),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
 	}, {
 		.fourcc = V4L2_PIX_FMT_Y12,
-		.codes = {MEDIA_BUS_FMT_Y12_1X12},
+		.codes = IMX_BUS_FMTS(MEDIA_BUS_FMT_Y12_1X12),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 16,
 		.bayer  = true,
@@ -203,16 +209,16 @@  static const struct imx_media_pixfmt *find_format(u32 fourcc,
 			 CS_SEL_YUV : CS_SEL_RGB);
 
 		if (!(fmt_cs_sel & cs_sel) ||
-		    (!allow_non_mbus && !fmt->codes[0]))
+		    (!allow_non_mbus && !fmt->codes))
 			continue;
 
 		if (fourcc && fmt->fourcc == fourcc)
 			return fmt;
 
-		if (!code)
+		if (!code || !fmt->codes)
 			continue;
 
-		for (j = 0; j < ARRAY_SIZE(fmt->codes) && fmt->codes[j]; j++) {
+		for (j = 0; fmt->codes[j]; j++) {
 			if (code == fmt->codes[j])
 				return fmt;
 		}
@@ -237,7 +243,7 @@  static int enum_format(u32 *fourcc, u32 *code, u32 index,
 			 CS_SEL_YUV : CS_SEL_RGB);
 
 		if (!(fmt_cs_sel & cs_sel) ||
-		    (!allow_non_mbus && !fmt->codes[0]))
+		    (!allow_non_mbus && !fmt->codes))
 			continue;
 
 		if (fourcc && index == 0) {
@@ -250,7 +256,7 @@  static int enum_format(u32 *fourcc, u32 *code, u32 index,
 			continue;
 		}
 
-		for (j = 0; j < ARRAY_SIZE(fmt->codes) && fmt->codes[j]; j++) {
+		for (j = 0; fmt->codes[j]; j++) {
 			if (index == 0) {
 				*code = fmt->codes[j];
 				return 0;
@@ -296,13 +302,13 @@  EXPORT_SYMBOL_GPL(imx_media_enum_mbus_format);
 static const struct imx_media_pixfmt ipu_formats[] = {
 	{
 		.fourcc = V4L2_PIX_FMT_YUV32,
-		.codes  = {MEDIA_BUS_FMT_AYUV8_1X32},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_AYUV8_1X32),
 		.cs     = IPUV3_COLORSPACE_YUV,
 		.bpp    = 32,
 		.ipufmt = true,
 	}, {
 		.fourcc	= V4L2_PIX_FMT_XRGB32,
-		.codes  = {MEDIA_BUS_FMT_ARGB8888_1X32},
+		.codes  = IMX_BUS_FMTS(MEDIA_BUS_FMT_ARGB8888_1X32),
 		.cs     = IPUV3_COLORSPACE_RGB,
 		.bpp    = 32,
 		.ipufmt = true,
@@ -327,7 +333,10 @@  imx_media_find_ipu_format(u32 code, enum codespace_sel cs_sel)
 		    (!accept_rgb && fmt->cs == IPUV3_COLORSPACE_RGB))
 			continue;
 
-		for (j = 0; j < ARRAY_SIZE(fmt->codes) && fmt->codes[j]; j++) {
+		if (!fmt->codes)
+			continue;
+
+		for (j = 0; fmt->codes[j]; j++) {
 			if (code == fmt->codes[j])
 				return fmt;
 		}
@@ -351,7 +360,10 @@  int imx_media_enum_ipu_format(u32 *code, u32 index, enum codespace_sel cs_sel)
 		    (!accept_rgb && fmt->cs == IPUV3_COLORSPACE_RGB))
 			continue;
 
-		for (j = 0; j < ARRAY_SIZE(fmt->codes) && fmt->codes[j]; j++) {
+		if (!fmt->codes)
+			continue;
+
+		for (j = 0; fmt->codes[j]; j++) {
 			if (index == 0) {
 				*code = fmt->codes[j];
 				return 0;
@@ -573,7 +585,8 @@  int imx_media_ipu_image_to_mbus_fmt(struct v4l2_mbus_framefmt *mbus,
 	memset(mbus, 0, sizeof(*mbus));
 	mbus->width = image->pix.width;
 	mbus->height = image->pix.height;
-	mbus->code = fmt->codes[0];
+	if (fmt->codes)
+		mbus->code = fmt->codes[0];
 	mbus->field = image->pix.field;
 	mbus->colorspace = image->pix.colorspace;
 	mbus->xfer_func = image->pix.xfer_func;
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 652673a703cd..917b4db02985 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -69,7 +69,7 @@  enum {
 
 struct imx_media_pixfmt {
 	u32     fourcc;
-	u32     codes[4];
+	const u32 *codes;
 	int     bpp;     /* total bpp */
 	/* cycles per pixel for generic (bayer) formats for the parallel bus */
 	int	cycles;