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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>
This commit is contained in:
Baruch Siach 2010-07-27 09:06:07 -03:00 committed by Mauro Carvalho Chehab
parent 1b376dac05
commit 5384a12b23
1 changed files with 4 additions and 0 deletions
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4
drivers/media/video/mx2_camera.c
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@ -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);
}