From: Sinclair Yeh <syeh@vmware.com>
Date: Wed, 29 Jun 2016 23:31:01 +0000 (-0700)
Subject: drm/vmwgfx: Add a check to handle host message failure
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a9cd9c044aa90ba2b31d1bf3e3432f38fb1d25fe;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

drm/vmwgfx: Add a check to handle host message failure

Discovered by static code analysis tool.  If for some reason communication
with the host fails more than preset number of retries, return an error
instead of return garbage.

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
index f0374f9b56ca..e57a0bad7a62 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
@@ -300,6 +300,9 @@ static int vmw_recv_msg(struct rpc_channel *channel, void **msg,
 		break;
 	}
 
+	if (retries == RETRIES)
+		return -EINVAL;
+
 	*msg_len = reply_len;
 	*msg     = reply;