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authorBaruch Siach <baruch@tkos.co.il>2010-07-27 09:06:07 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-09-27 22:22:03 -0300
commit5384a12b23160e11ff949a94172051476d308b66 (patch)
tree49d1d6cf9c20bcc80fe6f21b31ef19dcbf450620 /drivers/media
parent1b376dac05058ac5c9616a507d95c19ea5ea2646 (diff)
V4L/DVB: mx2_camera: fix a race causing NULL dereference
The mx25_camera_irq irq handler may get called after the camera has been deactivated (from mx2_camera_deactivate). Detect this situation, and bail out. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/mx2_camera.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index 66ff174151b..b6ea67221d1 100644
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -378,6 +378,9 @@ static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb,
spin_lock_irqsave(&pcdev->lock, flags);
+ if (*fb_active == NULL)
+ goto out;
+
vb = &(*fb_active)->vb;
dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, vb->bsize);
@@ -402,6 +405,7 @@ static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb,
*fb_active = buf;
+out:
spin_unlock_irqrestore(&pcdev->lock, flags);
}