Add check for the return value of alloc_ordered_workqueue as it may return
NULL pointer and cause NULL pointer dereference.

Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
Changelog:

v2 -> v3:

1. Simply return -ENOMEM instead of using ret.
2. No change of the "goto fail".

v1 -> v2:

1. Change the "goto fail" into "return ret" and drop the "fail" label.
---
 drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 89aadd3b3202..f167a45f1fbd 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1977,6 +1977,9 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 
 	/* setup workqueue */
 	msm_host->workqueue = alloc_ordered_workqueue("dsi_drm_work", 0);
+	if (!msm_host->workqueue)
+		return -ENOMEM;
+
 	INIT_WORK(&msm_host->err_work, dsi_err_worker);
 
 	msm_dsi->id = msm_host->id;
-- 
2.25.1

On Tue, 10 Jan 2023 10:16:51 +0800, Jiasheng Jiang wrote:
> Add check for the return value of alloc_ordered_workqueue as it may return
> NULL pointer and cause NULL pointer dereference.
> 
> 

Applied, thanks!

[1/1] drm/msm/dsi: Add missing check for alloc_ordered_workqueue
      https://gitlab.freedesktop.org/lumag/msm/-/commit/e5237cd6ad68

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

On 1/9/2023 6:16 PM, Jiasheng Jiang wrote:
> Add check for the return value of alloc_ordered_workqueue as it may return
> NULL pointer and cause NULL pointer dereference.
> 
> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---
> Changelog:
> 
> v2 -> v3:
> 
> 1. Simply return -ENOMEM instead of using ret.
> 2. No change of the "goto fail".
> 
> v1 -> v2:
> 
> 1. Change the "goto fail" into "return ret" and drop the "fail" label.
> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 89aadd3b3202..f167a45f1fbd 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1977,6 +1977,9 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
>   
>   	/* setup workqueue */
>   	msm_host->workqueue = alloc_ordered_workqueue("dsi_drm_work", 0);
> +	if (!msm_host->workqueue)
> +		return -ENOMEM;
> +
>   	INIT_WORK(&msm_host->err_work, dsi_err_worker);
>   
>   	msm_dsi->id = msm_host->id;