linux-kernel - [PATCH 4.19 222/243] drm/msm: fix memleak on release

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20191211150354.316779022@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:06:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Sean Paul <seanpaul@...omium.org>
Subject: [PATCH 4.19 222/243] drm/msm: fix memleak on release

From: Johan Hovold <johan@...nel.org>

commit a64fc11b9a520c55ca34d82e5ca32274f49b6b15 upstream.

If a process is interrupted while accessing the "gpu" debugfs file and
the drm device struct_mutex is contended, release() could return early
and fail to free related resources.

Note that the return value from release() is ignored.

Fixes: 4f776f4511c7 ("drm/msm/gpu: Convert the GPU show function to use the GPU state")
Cc: stable <stable@...r.kernel.org>     # 4.18
Cc: Jordan Crouse <jcrouse@...eaurora.org>
Cc: Rob Clark <robdclark@...il.com>
Reviewed-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191010131333.23635-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/msm/msm_debugfs.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/gpu/drm/msm/msm_debugfs.c
+++ b/drivers/gpu/drm/msm/msm_debugfs.c
@@ -53,12 +53,8 @@ static int msm_gpu_release(struct inode
 	struct msm_gpu_show_priv *show_priv = m->private;
 	struct msm_drm_private *priv = show_priv->dev->dev_private;
 	struct msm_gpu *gpu = priv->gpu;
-	int ret;
-
-	ret = mutex_lock_interruptible(&show_priv->dev->struct_mutex);
-	if (ret)
-		return ret;
 
+	mutex_lock(&show_priv->dev->struct_mutex);
 	gpu->funcs->gpu_state_put(show_priv->state);
 	mutex_unlock(&show_priv->dev->struct_mutex);