linux-kernel - [PATCH] sm501: unsigned ptr cannot be negative

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Message-ID: <49312C40.3080909@gmail.com>
Date:	Sat, 29 Nov 2008 06:49:20 -0500
From:	roel kluin <roel.kluin@...il.com>
To:	ben-linux@...ff.org
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] sm501: unsigned ptr cannot be negative

unsigned ptr cannot be negative

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/drivers/video/sm501fb.c b/drivers/video/sm501fb.c
index f94ae84..dcd9879 100644
--- a/drivers/video/sm501fb.c
+++ b/drivers/video/sm501fb.c
@@ -159,6 +159,9 @@ static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
 		break;
 
 	case SM501_MEMF_PANEL:
+		if (size > inf->fbmem_len)
+			return -ENOMEM;
+
 		ptr = inf->fbmem_len - size;
 		fbi = inf->fb[HEAD_CRT];
 
@@ -172,9 +175,6 @@ static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
 		if (fbi && ptr < fbi->fix.smem_len)
 			return -ENOMEM;
 
-		if (ptr < 0)
-			return -ENOMEM;
-
 		break;
 
 	case SM501_MEMF_CRT:

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