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drm/msm: fix an error code in the ioctl

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The copy_to/from_user() functions return the number of bytes remaining
to be copied but we should return -EFAULT to the user.

Fixes: f05c83e774 ("drm/msm: add uapi to get/set debug name")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Dan Carpenter 2019-02-14 10:19:27 +03:00 committed by Rob Clark
parent b6bd458c16
commit 7cce8e4efe
1 changed files with 6 additions and 4 deletions
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10
drivers/gpu/drm/msm/msm_drv.c
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@ -851,8 +851,9 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
ret = -EINVAL;
break;
}
ret = copy_from_user(msm_obj->name,
u64_to_user_ptr(args->value), args->len);
if (copy_from_user(msm_obj->name, u64_to_user_ptr(args->value),
args->len))
ret = -EFAULT;
msm_obj->name[args->len] = '\0';
for (i = 0; i < args->len; i++) {
if (!isprint(msm_obj->name[i])) {
@ -868,8 +869,9 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
}
args->len = strlen(msm_obj->name);
if (args->value) {
ret = copy_to_user(u64_to_user_ptr(args->value),
msm_obj->name, args->len);
if (copy_to_user(u64_to_user_ptr(args->value),
msm_obj->name, args->len))
ret = -EFAULT;
}
break;
}