| Message ID | 20191010131333.23635-3-johan@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | treewide: fix interrupted release | expand |
Hi Johan Thank you for the patch BR Fabien On 10/10/2019 3:13 PM, Johan Hovold wrote: > If a process is interrupted while accessing the video device and the > device lock is contended, release() could return early and fail to free > related resources. > > Note that the return value of the v4l2 release file operation is > ignored. > > Fixes: 28ffeebbb7bd ("[media] bdisp: 2D blitter driver using v4l2 mem2mem framework") > Cc: stable <stable@vger.kernel.org> # 4.2 > Cc: Fabien Dessenne <fabien.dessenne@st.com> > Cc: Hans Verkuil <hans.verkuil@cisco.com> > Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> > Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com> > --- > drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c > index e90f1ba30574..675b5f2b4c2e 100644 > --- a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c > +++ b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c > @@ -651,8 +651,7 @@ static int bdisp_release(struct file *file) > > dev_dbg(bdisp->dev, "%s\n", __func__); > > - if (mutex_lock_interruptible(&bdisp->lock)) > - return -ERESTARTSYS; > + mutex_lock(&bdisp->lock); > > v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >
diff --git a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c index e90f1ba30574..675b5f2b4c2e 100644 --- a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c +++ b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c @@ -651,8 +651,7 @@ static int bdisp_release(struct file *file) dev_dbg(bdisp->dev, "%s\n", __func__); - if (mutex_lock_interruptible(&bdisp->lock)) - return -ERESTARTSYS; + mutex_lock(&bdisp->lock); v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
If a process is interrupted while accessing the video device and the device lock is contended, release() could return early and fail to free related resources. Note that the return value of the v4l2 release file operation is ignored. Fixes: 28ffeebbb7bd ("[media] bdisp: 2D blitter driver using v4l2 mem2mem framework") Cc: stable <stable@vger.kernel.org> # 4.2 Cc: Fabien Dessenne <fabien.dessenne@st.com> Cc: Hans Verkuil <hans.verkuil@cisco.com> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: Johan Hovold <johan@kernel.org> --- drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)