linux-kernel - [PATCH] drm/vmwgfx: fix memory leak when too many retries have occurred

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Message-Id: <20190621223534.14283-1-colin.king@canonical.com>
Date:   Fri, 21 Jun 2019 23:35:34 +0100
From:   Colin King <colin.king@...onical.com>
To:     VMware Graphics <linux-graphics-maintainer@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/vmwgfx: fix memory leak when too many retries have occurred

From: Colin Ian King <colin.king@...onical.com>

Currently when too many retries have occurred there is a memory
leak on the allocation for reply on the error return path. Fix
this by kfree'ing reply before returning.

Addresses-Coverity: ("Resource leak")
Fixes: a9cd9c044aa9 ("drm/vmwgfx: Add a check to handle host message failure")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
index 8b9270f31409..8b61f16f50cf 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
@@ -301,8 +301,10 @@ static int vmw_recv_msg(struct rpc_channel *channel, void **msg,
 		break;
 	}
 
-	if (retries == RETRIES)
+	if (retries == RETRIES) {
+		kfree(reply);
 		return -EINVAL;
+	}
 
 	*msg_len = reply_len;
 	*msg     = reply;
-- 
2.20.1