[PATCH AUTOSEL 4.9 153/251] drm/msm/mdp5: Fix mdp5_cfg_init error return

Sasha Levin
2020-01-16T18:06:58Z

From: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>

[ Upstream commit fc19cbb785d7bbd1a1af26229b5240a3ab332744 ]

If mdp5_cfg_init fails because of an unknown major version, a null pointer
dereference occurs. This is because the caller of init expects error
pointers, but init returns NULL on error. Fix this by returning the
expected values on error.

Fixes: 2e362e1772b8 (drm/msm/mdp5: introduce mdp5_cfg module)
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
index 8b4e3004f451..86b0448d2ce5 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
@@ -542,7 +542,7 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
if (cfg_handler)
mdp5_cfg_destroy(cfg_handler);

- return NULL;
+ return ERR_PTR(ret);
}

static struct mdp5_cfg_platform *mdp5_get_config(struct platform_device *dev)
--
2.20.1