[Intel-gfx] [PATCH i-g-t] tests/kms_dp_dsc: Avoid SIGSEGV when release DRM connector.

[Mark Yacoub]

On Fri, Jun 4, 2021 at 2:48 PM Mark Yacoub <markyacoub at chromium.org> wrote:
>
> On Mon, May 31, 2021 at 11:34 AM Lee Shawn C <shawn.c.lee at intel.com> wrote:
> >
> > Got SIGSEGV fault while running kms_dp_dsc test but did not
> > connect DP DSC capable monitor on eDP/DP port. This test daemon
> > should "SKIP" test without any problem. We found kms_dp_dsc
> > can't get proper drmModeConnector and caused this SIGSEGV fault
> > when release it. Make sure drmModeConnector is available before
> > free it can avoid this issue.
> >
> Tested on ChromeOS on TGL (Delbin) and JSL (Drawlat).
Tested on ChromeOS AMD (Zork) with Kernel 5.4
> Tested-by: Mark Yacoub <markyacoub at chromium.org>
> > Signed-off-by: Lee Shawn C <shawn.c.lee at intel.com>
> > ---
> >  tests/kms_dp_dsc.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/tests/kms_dp_dsc.c b/tests/kms_dp_dsc.c
> > index 2446fd82bba3..ea7c9f4f72ce 100644
> > --- a/tests/kms_dp_dsc.c
> > +++ b/tests/kms_dp_dsc.c
> > @@ -262,7 +262,7 @@ igt_main
> >         data_t data = {};
> >         igt_output_t *output;
> >         drmModeRes *res;
> > -       drmModeConnector *connector;
> > +       drmModeConnector *connector = NULL;
> >         int i, test_conn_cnt, test_cnt;
> >         int tests[] = {DRM_MODE_CONNECTOR_eDP, DRM_MODE_CONNECTOR_DisplayPort};
> >
> > @@ -311,7 +311,8 @@ igt_main
> >         }
> >
> >         igt_fixture {
> > -               drmModeFreeConnector(connector);
> > +               if (connector)
> > +                       drmModeFreeConnector(connector);
> >                 drmModeFreeResources(res);
> >                 close(data.debugfs_fd);
> >                 close(data.drm_fd);
> > --
> > 2.17.1
> >