[media] s5p-fimc: Correct memory allocation for VIDIOC_CREATE_BUFS

The commit 3b4c34aac7abea4754059084d0eef667a1993ac8
"s5p-fimc: Add support for VIDIOC_PREPARE_BUF/CREATE_BUFS ioctls"
added a handler for VIDIOC_CREATE_BUFS ioctl, but the queue_setup
callback wasn't updated to properly interpret the pixel format.
In this situation memory corruption may happen with VIDIOC_CREATE_BUFS
ioctl. Update the queue_setup op to fix this.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 23 insertions, 14 deletions

diff --git a/drivers/media/video/s5p-fimc/fimc-capture.c b/drivers/media/video/s5p-fimc/fimc-capture.c
index fcf3a14d013e..7e9b2c612b03 100644
--- a/drivers/media/video/s5p-fimc/fimc-capture.c
+++ b/drivers/media/video/s5p-fimc/fimc-capture.c
@@ -246,28 +246,37 @@ int fimc_capture_resume(struct fimc_dev *fimc)
 
 }
 
-static unsigned int get_plane_size(struct fimc_frame *fr, unsigned int plane)
-{
-        if (!fr || plane >= fr->fmt->memplanes)
-                return 0;
-        return fr->f_width * fr->f_height * fr->fmt->depth[plane] / 8;
-}
-
-static int queue_setup(struct vb2_queue *vq,  const struct v4l2_format *pfmt,
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *pfmt,
                        unsigned int *num_buffers, unsigned int *num_planes,
                        unsigned int sizes[], void *allocators[])
 {
+        const struct v4l2_pix_format_mplane *pixm = NULL;
         struct fimc_ctx *ctx = vq->drv_priv;
-        struct fimc_fmt *fmt = ctx->d_frame.fmt;
+        struct fimc_frame *frame = &ctx->d_frame;
+        struct fimc_fmt *fmt = frame->fmt;
+        unsigned long wh;
         int i;
 
-        if (!fmt)
+        if (pfmt) {
+                pixm = &pfmt->fmt.pix_mp;
+                fmt = fimc_find_format(&pixm->pixelformat, NULL,
+                                       FMT_FLAGS_CAM | FMT_FLAGS_M2M, -1);
+                wh = pixm->width * pixm->height;
+        } else {
+                wh = frame->f_width * frame->f_height;
+        }
+
+        if (fmt == NULL)
                 return -EINVAL;
 
         *num_planes = fmt->memplanes;
 
         for (i = 0; i < fmt->memplanes; i++) {
-                sizes[i] = get_plane_size(&ctx->d_frame, i);
+                unsigned int size = (wh * fmt->depth[i]) / 8;
+                if (pixm)
+                        sizes[i] = max(size, pixm->plane_fmt[i].sizeimage);
+                else
+                        sizes[i] = size;
                 allocators[i] = ctx->fimc_dev->alloc_ctx;
         }
 
diff --git a/drivers/media/video/s5p-fimc/fimc-core.c b/drivers/media/video/s5p-fimc/fimc-core.c
index e184e650022a..e09ba7b0076e 100644
--- a/drivers/media/video/s5p-fimc/fimc-core.c
+++ b/drivers/media/video/s5p-fimc/fimc-core.c
@@ -1048,14 +1048,14 @@ static int fimc_m2m_g_fmt_mplane(struct file *file, void *fh,
  * @mask: the color flags to match
  * @index: offset in the fimc_formats array, ignored if negative
  */
-struct fimc_fmt *fimc_find_format(u32 *pixelformat, u32 *mbus_code,
+struct fimc_fmt *fimc_find_format(const u32 *pixelformat, const u32 *mbus_code,
                                   unsigned int mask, int index)
 {
         struct fimc_fmt *fmt, *def_fmt = NULL;
         unsigned int i;
         int id = 0;
 
-        if (index >= ARRAY_SIZE(fimc_formats))
+        if (index >= (int)ARRAY_SIZE(fimc_formats))
                 return NULL;
 
         for (i = 0; i < ARRAY_SIZE(fimc_formats); ++i) {
diff --git a/drivers/media/video/s5p-fimc/fimc-core.h b/drivers/media/video/s5p-fimc/fimc-core.h
index a18291e648e2..84fd83550bd7 100644
--- a/drivers/media/video/s5p-fimc/fimc-core.h
+++ b/drivers/media/video/s5p-fimc/fimc-core.h
@@ -718,7 +718,7 @@ void fimc_alpha_ctrl_update(struct fimc_ctx *ctx);
 int fimc_fill_format(struct fimc_frame *frame, struct v4l2_format *f);
 void fimc_adjust_mplane_format(struct fimc_fmt *fmt, u32 width, u32 height,
                                struct v4l2_pix_format_mplane *pix);
-struct fimc_fmt *fimc_find_format(u32 *pixelformat, u32 *mbus_code,
+struct fimc_fmt *fimc_find_format(const u32 *pixelformat, const u32 *mbus_code,
                                   unsigned int mask, int index);
 
 int fimc_check_scaler_ratio(struct fimc_ctx *ctx, int sw, int sh,