From: Hector Martin <hector@marcansoft.com>
Date: Sat, 12 Mar 2011 22:41:28 +0000 (+0100)
Subject: Fix off-by-one out of bounds/memory corruption bug in sobel
X-Git-Url: https://gitweb.aptx.org/?a=commitdiff_plain;h=1630d845fb1055a630faab26916371166daf7cb9;p=openlase.git

Fix off-by-one out of bounds/memory corruption bug in sobel
---

diff --git a/libol/trace.c b/libol/trace.c
index 4d27dd5..aa077ad 100644
--- a/libol/trace.c
+++ b/libol/trace.c
@@ -547,7 +547,7 @@ static void find_edges_canny(OLTraceCtx *ctx, uint8_t *src, unsigned int stride)
 		px = ctx->sxbuf + y*ctx->aw + 2;
 		py = ctx->sybuf + y*ctx->aw + 2;
 		pm = ctx->smbuf + y*ctx->aw + 2;
-		for (x = 1; x < (ctx->p.width-2); x++) {
+		for (x = 2; x < (ctx->p.width-2); x++) {
 			uint32_t gm = *pm;
 			if (gm > low_t)  {
 				int16_t gx = *px;