6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jonas Karlman jonas@kwiboo.se
[ Upstream commit 342f7e4967d02b0ec263b15916304fc54841b608 ]
It's possible for users to try to duplicate the CRTC state even when the state doesn't exist. drm_atomic_helper_crtc_duplicate_state() (and other users of __drm_atomic_helper_crtc_duplicate_state()) already guard this with a WARN_ON() instead of crashing, so let's do that here too.
Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver") Signed-off-by: Jonas Karlman jonas@kwiboo.se Reviewed-by: Sascha Hauer s.hauer@pengutronix.de Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20230621223311.2239547-5-jonas... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c index 583df4d22f7e9..d843c19c146db 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c @@ -2098,11 +2098,13 @@ static void vop2_crtc_reset(struct drm_crtc *crtc)
static struct drm_crtc_state *vop2_crtc_duplicate_state(struct drm_crtc *crtc) { - struct rockchip_crtc_state *vcstate, *old_vcstate; + struct rockchip_crtc_state *vcstate;
- old_vcstate = to_rockchip_crtc_state(crtc->state); + if (WARN_ON(!crtc->state)) + return NULL;
- vcstate = kmemdup(old_vcstate, sizeof(*old_vcstate), GFP_KERNEL); + vcstate = kmemdup(to_rockchip_crtc_state(crtc->state), + sizeof(*vcstate), GFP_KERNEL); if (!vcstate) return NULL;