From 9378cecb1ce5d618b8aff4d65113ddcf72fc1011 Mon Sep 17 00:00:00 2001
From: Maciej Purski <m.purski@samsung.com>
Date: Wed, 22 Nov 2017 10:08:38 +0100
Subject: [PATCH] drm/bridge/sii8620: fix potential buffer overflow
Git-commit: 9378cecb1ce5d618b8aff4d65113ddcf72fc1011
Patch-mainline: v4.18-rc2
References: bsc#1051510

Buffer overflow error should not occur, as mode_fixup() callback
filters pixel clock value and it should never exceed 600000. However,
current implementation is not obviously safe and relies on
implementation of mode_fixup().

Make 'i' variable never reach unsafe value in order to avoid buffer
overflow error.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: bf1722ca ("drm/bridge/sii8620: rewrite hdmi start sequence")
Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1511341718-6974-1-git-send-email-m.purski@samsung.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/bridge/sil-sii8620.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -1226,7 +1226,7 @@ static void sii8620_start_video(struct s
 		int clk = ctx->pixel_clock * (ctx->use_packed_pixel ? 2 : 3);
 		int i;
 
-		for (i = 0; i < ARRAY_SIZE(clk_spec); ++i)
+		for (i = 0; i < ARRAY_SIZE(clk_spec) - 1; ++i)
 			if (clk < clk_spec[i].max_clk)
 				break;