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

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Message-Id: <1550601422-30651-1-git-send-email-jcrouse@codeaurora.org>
Date:   Tue, 19 Feb 2019 11:37:02 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     freedreno@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, Sean Paul <sean@...rly.run>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH] drm/msm: Truncate the buffer object name if the copy from user failed

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@...cle.com>
Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 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