Re: [PATCH -next] drm/msm/adreno: Switch to memdup_user_nul() helper
From: Dmitry Baryshkov
Date: Fri Aug 26 2022 - 06:12:27 EST
On 26/08/2022 11:45, Yang Yingliang wrote:
Use memdup_user_nul() helper instead of open-coding to
simplify the code.
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 382fb7f9e497..50b33e14237b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -339,17 +339,9 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
case MSM_PARAM_CMDLINE: {
char *str, **paramp;
- str = kmalloc(len + 1, GFP_KERNEL);
- if (!str)
- return -ENOMEM;
-
- if (copy_from_user(str, u64_to_user_ptr(value), len)) {
- kfree(str);
- return -EFAULT;
- }
-
- /* Ensure string is null terminated: */
- str[len] = '\0';
+ str = memdup_user_nul(u64_to_user_ptr(value), len);
+ if (IS_ERR(str))
+ return PTR_ERR(str);
if (param == MSM_PARAM_COMM) {
paramp = &ctx->comm;
--
With best wishes
Dmitry