[media] uvcvideo: Fix race-related crash in uvc_video_clock_update()

The driver frees the clock samples buffer before stopping the video
buffers queue. If a DQBUF call arrives in-between,
uvc_video_clock_update() will be called with a NULL clock samples
buffer, leading to a crash. This occurs very frequently when using the
webcam with the flash browser plugin.

Move clock initialization/cleanup to uvc_video_enable() in order to free
the clock samples buffer after the queue is stopped. Make sure the clock
is reset at resume time to avoid miscalculating timestamps.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index 4a44f9a..b76b0ac 100644 (file)
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -468,22 +468,30 @@ uvc_video_clock_decode(struct uvc_streaming *stream, struct uvc_buffer *buf,
        spin_unlock_irqrestore(&stream->clock.lock, flags);
 }
 
-static int uvc_video_clock_init(struct uvc_streaming *stream)
+static void uvc_video_clock_reset(struct uvc_streaming *stream)
 {
        struct uvc_clock *clock = &stream->clock;
 
-       spin_lock_init(&clock->lock);
        clock->head = 0;
        clock->count = 0;
-       clock->size = 32;
        clock->last_sof = -1;
        clock->sof_offset = -1;
+}
+
+static int uvc_video_clock_init(struct uvc_streaming *stream)
+{
+       struct uvc_clock *clock = &stream->clock;
+
+       spin_lock_init(&clock->lock);
+       clock->size = 32;
 
        clock->samples = kmalloc(clock->size * sizeof(*clock->samples),
                                 GFP_KERNEL);
        if (clock->samples == NULL)
                return -ENOMEM;
 
+       uvc_video_clock_reset(stream);
+
        return 0;
 }
 
@@ -1424,8 +1432,6 @@ static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers)
 
        if (free_buffers)
                uvc_free_urb_buffers(stream);
-
-       uvc_video_clock_cleanup(stream);
 }
 
 /*
@@ -1555,10 +1561,6 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags)
 
        uvc_video_stats_start(stream);
 
-       ret = uvc_video_clock_init(stream);
-       if (ret < 0)
-               return ret;
-
        if (intf->num_altsetting > 1) {
                struct usb_host_endpoint *best_ep = NULL;
                unsigned int best_psize = 3 * 1024;
@@ -1683,6 +1685,8 @@ int uvc_video_resume(struct uvc_streaming *stream, int reset)
 
        stream->frozen = 0;
 
+       uvc_video_clock_reset(stream);
+
        ret = uvc_commit_video(stream, &stream->ctrl);
        if (ret < 0) {
                uvc_queue_enable(&stream->queue, 0);
@@ -1819,25 +1823,35 @@ int uvc_video_enable(struct uvc_streaming *stream, int enable)
                uvc_uninit_video(stream, 1);
                usb_set_interface(stream->dev->udev, stream->intfnum, 0);
                uvc_queue_enable(&stream->queue, 0);
+               uvc_video_clock_cleanup(stream);
                return 0;
        }
 
-       ret = uvc_queue_enable(&stream->queue, 1);
+       ret = uvc_video_clock_init(stream);
        if (ret < 0)
                return ret;
 
+       ret = uvc_queue_enable(&stream->queue, 1);
+       if (ret < 0)
+               goto error_queue;
+
        /* Commit the streaming parameters. */
        ret = uvc_commit_video(stream, &stream->ctrl);
-       if (ret < 0) {
-               uvc_queue_enable(&stream->queue, 0);
-               return ret;
-       }
+       if (ret < 0)
+               goto error_commit;
 
        ret = uvc_init_video(stream, GFP_KERNEL);
-       if (ret < 0) {
-               usb_set_interface(stream->dev->udev, stream->intfnum, 0);
-               uvc_queue_enable(&stream->queue, 0);
-       }
+       if (ret < 0)
+               goto error_video;
+
+       return 0;
+
+error_video:
+       usb_set_interface(stream->dev->udev, stream->intfnum, 0);
+error_commit:
+       uvc_queue_enable(&stream->queue, 0);
+error_queue:
+       uvc_video_clock_cleanup(stream);
 
        return ret;
 }