[PATCH 5.18 368/879] drm/msm/disp/dpu1: set vbif hw config to NULL to avoid use after memory free during pm runtime resume

Greg Kroah-Hartman
2022-06-08T00:15:43Z

From: Vinod Polimera <quic_vpolimer@quicinc.com>

[ Upstream commit fa5186b279ecf44b14fb435540d2065be91cb1ed ]

BUG: Unable to handle kernel paging request at virtual address 006b6b6b6b6b6be3

Call trace:
dpu_vbif_init_memtypes+0x40/0xb8
dpu_runtime_resume+0xcc/0x1c0
pm_generic_runtime_resume+0x30/0x44
__genpd_runtime_resume+0x68/0x7c
genpd_runtime_resume+0x134/0x258
__rpm_callback+0x98/0x138
rpm_callback+0x30/0x88
rpm_resume+0x36c/0x49c
__pm_runtime_resume+0x80/0xb0
dpu_core_irq_uninstall+0x30/0xb0
dpu_irq_uninstall+0x18/0x24
msm_drm_uninit+0xd8/0x16c

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/483255/
Link: https://lore.kernel.org/r/1650857213-30075-1-git-send-email-quic_vpolimer@quicinc.com
[DB: fixed Fixes tag]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index e29796c4f27b..ad13a9423601 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -793,8 +793,10 @@ static void _dpu_kms_hw_destroy(struct dpu_kms *dpu_kms)
for (i = 0; i < dpu_kms->catalog->vbif_count; i++) {
u32 vbif_idx = dpu_kms->catalog->vbif[i].id;

- if ((vbif_idx < VBIF_MAX) && dpu_kms->hw_vbif[vbif_idx])
+ if ((vbif_idx < VBIF_MAX) && dpu_kms->hw_vbif[vbif_idx]) {
dpu_hw_vbif_destroy(dpu_kms->hw_vbif[vbif_idx]);
+ dpu_kms->hw_vbif[vbif_idx] = NULL;
+ }
}
}

--
2.35.1