From: Lloyd Atkinson <latkinso@codeaurora.org>
Date: Tue, 16 Jan 2018 21:26:02 +0000 (-0500)
Subject: drm/msm/dsi: correct DSI id bounds check during registration
X-Git-Tag: v4.17-rc1~185^2~10^2~34
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=6e1787cf45e48866c01dadc2a1b6c3d63d75b8d1;p=linux.git

drm/msm/dsi: correct DSI id bounds check during registration

Check DSI instance id argument against the proper boundary size
to protect against invalid configuration of the DSI id.

Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
---

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 1a54fd67c9c4..4cb1cb68878b 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -862,7 +862,7 @@ int msm_dsi_manager_register(struct msm_dsi *msm_dsi)
 	int id = msm_dsi->id;
 	int ret;
 
-	if (id > DSI_MAX) {
+	if (id >= DSI_MAX) {
 		pr_err("%s: invalid id %d\n", __func__, id);
 		return -EINVAL;
 	}