[media] s5p-fimc: Don't allocate fimc-capture video device dynamically

This fixes potential invalid pointer de-reference, when
media_entity_cleanup() is called before video device
is unregistered.

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>

diff --git a/drivers/media/platform/s5p-fimc/fimc-capture.c b/drivers/media/platform/s5p-fimc/fimc-capture.c
index 8e413dd..5d3a70f 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-capture.c
+++ b/drivers/media/platform/s5p-fimc/fimc-capture.c
@@ -304,7 +304,7 @@ int fimc_capture_resume(struct fimc_dev *fimc)
 
        INIT_LIST_HEAD(&fimc->vid_cap.active_buf_q);
        vid_cap->buf_index = 0;
-       fimc_pipeline_initialize(&fimc->pipeline, &vid_cap->vfd->entity,
+       fimc_pipeline_initialize(&fimc->pipeline, &vid_cap->vfd.entity,
                                 false);
        fimc_capture_hw_init(fimc);
 
@@ -371,7 +371,7 @@ static int buffer_prepare(struct vb2_buffer *vb)
                unsigned long size = ctx->d_frame.payload[i];
 
                if (vb2_plane_size(vb, i) < size) {
-                       v4l2_err(ctx->fimc_dev->vid_cap.vfd,
+                       v4l2_err(&ctx->fimc_dev->vid_cap.vfd,
                                 "User buffer too small (%ld < %ld)\n",
                                 vb2_plane_size(vb, i), size);
                        return -EINVAL;
@@ -503,7 +503,7 @@ static int fimc_capture_open(struct file *file)
 
        if (++fimc->vid_cap.refcnt == 1) {
                ret = fimc_pipeline_initialize(&fimc->pipeline,
-                                      &fimc->vid_cap.vfd->entity, true);
+                                      &fimc->vid_cap.vfd.entity, true);
 
                if (!ret && !fimc->vid_cap.user_subdev_api)
                        ret = fimc_capture_set_default_format(fimc);
@@ -1587,7 +1587,7 @@ static int fimc_capture_set_default_format(struct fimc_dev *fimc)
 static int fimc_register_capture_device(struct fimc_dev *fimc,
                                 struct v4l2_device *v4l2_dev)
 {
-       struct video_device *vfd;
+       struct video_device *vfd = &fimc->vid_cap.vfd;
        struct fimc_vid_cap *vid_cap;
        struct fimc_ctx *ctx;
        struct vb2_queue *q;
@@ -1604,25 +1604,19 @@ static int fimc_register_capture_device(struct fimc_dev *fimc,
        ctx->s_frame.fmt = fimc_find_format(NULL, NULL, FMT_FLAGS_CAM, 0);
        ctx->d_frame.fmt = ctx->s_frame.fmt;
 
-       vfd = video_device_alloc();
-       if (!vfd) {
-               v4l2_err(v4l2_dev, "Failed to allocate video device\n");
-               goto err_vd_alloc;
-       }
-
+       memset(vfd, 0, sizeof(*vfd));
        snprintf(vfd->name, sizeof(vfd->name), "fimc.%d.capture", fimc->id);
 
        vfd->fops       = &fimc_capture_fops;
        vfd->ioctl_ops  = &fimc_capture_ioctl_ops;
        vfd->v4l2_dev   = v4l2_dev;
        vfd->minor      = -1;
-       vfd->release    = video_device_release;
+       vfd->release    = video_device_release_empty;
        vfd->lock       = &fimc->lock;
 
        video_set_drvdata(vfd, fimc);
 
        vid_cap = &fimc->vid_cap;
-       vid_cap->vfd = vfd;
        vid_cap->active_buf_cnt = 0;
        vid_cap->reqbufs_count  = 0;
        vid_cap->refcnt = 0;
@@ -1660,8 +1654,6 @@ static int fimc_register_capture_device(struct fimc_dev *fimc,
 err_vd:
        media_entity_cleanup(&vfd->entity);
 err_ent:
-       video_device_release(vfd);
-err_vd_alloc:
        kfree(ctx);
        return ret;
 }
@@ -1691,12 +1683,10 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
 
        fimc_unregister_m2m_device(fimc);
 
-       if (fimc->vid_cap.vfd) {
-               media_entity_cleanup(&fimc->vid_cap.vfd->entity);
-               video_unregister_device(fimc->vid_cap.vfd);
-               fimc->vid_cap.vfd = NULL;
+       if (video_is_registered(&fimc->vid_cap.vfd)) {
+               video_unregister_device(&fimc->vid_cap.vfd);
+               media_entity_cleanup(&fimc->vid_cap.vfd.entity);
        }
-
        kfree(fimc->vid_cap.ctx);
        fimc->vid_cap.ctx = NULL;
 }

diff --git a/drivers/media/platform/s5p-fimc/fimc-core.h b/drivers/media/platform/s5p-fimc/fimc-core.h
index 808ccc6..30f93f2 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-core.h
+++ b/drivers/media/platform/s5p-fimc/fimc-core.h
@@ -320,7 +320,7 @@ struct fimc_m2m_device {
 struct fimc_vid_cap {
        struct fimc_ctx                 *ctx;
        struct vb2_alloc_ctx            *alloc_ctx;
-       struct video_device             *vfd;
+       struct video_device             vfd;
        struct v4l2_subdev              subdev;
        struct media_pad                vd_pad;
        struct v4l2_mbus_framefmt       mf;

diff --git a/drivers/media/platform/s5p-fimc/fimc-mdevice.c b/drivers/media/platform/s5p-fimc/fimc-mdevice.c
index 0dd26b6..3c76bd9 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-mdevice.c
+++ b/drivers/media/platform/s5p-fimc/fimc-mdevice.c
@@ -696,7 +696,7 @@ static int fimc_md_create_links(struct fimc_md *fmd)
                if (!fmd->fimc[i])
                        continue;
                source = &fmd->fimc[i]->vid_cap.subdev.entity;
-               sink = &fmd->fimc[i]->vid_cap.vfd->entity;
+               sink = &fmd->fimc[i]->vid_cap.vfd.entity;
                ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
                                              sink, 0, flags);
                if (ret)

diff --git a/drivers/media/platform/s5p-fimc/fimc-mdevice.h b/drivers/media/platform/s5p-fimc/fimc-mdevice.h
index 1f5dbaf..d310d9c 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-mdevice.h
+++ b/drivers/media/platform/s5p-fimc/fimc-mdevice.h
@@ -99,14 +99,12 @@ static inline struct fimc_md *entity_to_fimc_mdev(struct media_entity *me)
 
 static inline void fimc_md_graph_lock(struct fimc_dev *fimc)
 {
-       BUG_ON(fimc->vid_cap.vfd == NULL);
-       mutex_lock(&fimc->vid_cap.vfd->entity.parent->graph_mutex);
+       mutex_lock(&fimc->vid_cap.vfd.entity.parent->graph_mutex);
 }
 
 static inline void fimc_md_graph_unlock(struct fimc_dev *fimc)
 {
-       BUG_ON(fimc->vid_cap.vfd == NULL);
-       mutex_unlock(&fimc->vid_cap.vfd->entity.parent->graph_mutex);
+       mutex_unlock(&fimc->vid_cap.vfd.entity.parent->graph_mutex);
 }
 
 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on);

diff --git a/drivers/media/platform/s5p-fimc/fimc-reg.c b/drivers/media/platform/s5p-fimc/fimc-reg.c
index 0e3eb9c..783408f 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-reg.c
+++ b/drivers/media/platform/s5p-fimc/fimc-reg.c
@@ -612,7 +612,7 @@ int fimc_hw_set_camera_source(struct fimc_dev *fimc,
                }
 
                if (i == ARRAY_SIZE(pix_desc)) {
-                       v4l2_err(fimc->vid_cap.vfd,
+                       v4l2_err(&fimc->vid_cap.vfd,
                                 "Camera color format not supported: %d\n",
                                 fimc->vid_cap.mf.code);
                        return -EINVAL;
@@ -684,7 +684,7 @@ int fimc_hw_set_camera_type(struct fimc_dev *fimc,
                        cfg |= FIMC_REG_CIGCTRL_CAM_JPEG;
                        break;
                default:
-                       v4l2_err(vid_cap->vfd,
+                       v4l2_err(&vid_cap->vfd,
                                 "Not supported camera pixel format: %#x\n",
                                 vid_cap->mf.code);
                        return -EINVAL;
@@ -701,7 +701,7 @@ int fimc_hw_set_camera_type(struct fimc_dev *fimc,
                cfg |= FIMC_REG_CIGCTRL_CAMIF_SELWB;
                break;
        default:
-               v4l2_err(vid_cap->vfd, "Invalid camera bus type selected\n");
+               v4l2_err(&vid_cap->vfd, "Invalid camera bus type selected\n");
                return -EINVAL;
        }
        writel(cfg, fimc->regs + FIMC_REG_CIGCTRL);