linux-kernel - [PATCH] DVB: negative internal->sub

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Message-ID: <4973BCD3.6080803@gmail.com>
Date:	Mon, 19 Jan 2009 00:35:47 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	mchehab@...hat.com
CC:	video4linux-list@...hat.com, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] DVB: negative internal->sub_range won't get noticed

internal->sub_range is unsigned, a negative won't get noticed.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/drivers/media/dvb/frontends/stb0899_algo.c b/drivers/media/dvb/frontends/stb0899_algo.c
index 83dc7e1..2ea32da 100644
--- a/drivers/media/dvb/frontends/stb0899_algo.c
+++ b/drivers/media/dvb/frontends/stb0899_algo.c
@@ -464,13 +464,14 @@ static void next_sub_range(struct stb0899_state *state)
 
 	if (internal->sub_dir > 0) {
 		old_sub_range = internal->sub_range;
-		internal->sub_range = MIN((internal->srch_range / 2) -
+		if (internal->tuner_offst + internal->sub_range / 2 >=
+				internal->srch_range / 2)
+			internal->sub_range = 0;
+		else
+			internal->sub_range = MIN((internal->srch_range / 2) -
 					  (internal->tuner_offst + internal->sub_range / 2),
 					   internal->sub_range);
 
-		if (internal->sub_range < 0)
-			internal->sub_range = 0;
-
 		internal->tuner_offst += (old_sub_range + internal->sub_range) / 2;
 	}
 

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