[PATCH] drm/msm: Truncate the buffer object name if the copy from user failed

From: Jordan Crouse
Date: Tue Feb 19 2019 - 13:37:11 EST


If there is a error while doing a copy_from_user() for MSM_INFO_SET_NAME
make sure to truncate the object name so that there isn't a chance that
we'll have random data in the string.

This is on top of [1] reported and fixed by Dan Carpenter.

[1] https://patchwork.freedesktop.org/series/56656/

Fixes: f05c83e77460 ("drm/msm: add uapi to get/set debug name")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
---

drivers/gpu/drm/msm/msm_drv.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 87eae44..9ca558d 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -852,8 +852,11 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
break;
}
if (copy_from_user(msm_obj->name, u64_to_user_ptr(args->value),
- args->len))
+ args->len)) {
+ msm_obj->name[0] = '\0'
ret = -EFAULT;
+ break;
+ }
msm_obj->name[args->len] = '\0';
for (i = 0; i < args->len; i++) {
if (!isprint(msm_obj->name[i])) {
--
2.7.4