Hi, Is anything missing here? How can I get this merged? Best regards, Frédéric Pierret On 2020-02-08 20:43, Frédéric Pierret wrote: > Pointer to structure array is assumed not NULL by default. It has > the consequence to raise a kernel panic when it's not the case. > > Basically, running at least a RTX2080TI on Xen makes a bad mmio error > which causes having 'mthd' pointer to be NULL in 'channv50.c'. From the > code, it's assumed to be not NULL by accessing directly 'mthd->data[0]' > which is the reason of the kernel panic. Simply check if the pointer > is not NULL before continuing. > > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206299 > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Frédéric Pierret (fepitre) <frederic.pierret@xxxxxxxxxxxx> > --- > drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c > index bcf32d92ee5a..50e3539f33d2 100644 > --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c > @@ -74,6 +74,8 @@ nv50_disp_chan_mthd(struct nv50_disp_chan *chan, int debug) > > if (debug > subdev->debug) > return; > + if (!mthd) > + return; > > for (i = 0; (list = mthd->data[i].mthd) != NULL; i++) { > u32 base = chan->head * mthd->addr; >
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