From 76c635ceeebcb78ecd22807171c2e2c21c58e05f Mon Sep 17 00:00:00 2001
From: danblooomberg <dan.bloomberg@gmail.com>
Date: Fri, 26 Apr 2024 12:27:19 -0700
Subject: [PATCH] Add check for number of corner points in ptaConvertToBox() *
 also for Issue 743, in pixWriteStreamBmp() check for colormap before  
 referencing in DEBUG clause

---
 src/bmpio.c    | 3 ++-
 src/boxfunc4.c | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/bmpio.c b/src/bmpio.c
index 5b09354df..6da03d98e 100644
--- a/src/bmpio.c
+++ b/src/bmpio.c
@@ -565,7 +565,8 @@ RGBA_QUAD  *pquad;
     }
 
 #if DEBUG
-    {l_uint8  *pcmptr;
+    if (pixGetColormap(pix) != NULL) {
+        l_uint8  *pcmptr;
         pcmptr = (l_uint8 *)pixGetColormap(pix)->array;
         lept_stderr("Pix colormap[0] = %c%c%c%d\n",
                     pcmptr[0], pcmptr[1], pcmptr[2], pcmptr[3]);
diff --git a/src/boxfunc4.c b/src/boxfunc4.c
index fc130f4a0..5f79e0af1 100644
--- a/src/boxfunc4.c
+++ b/src/boxfunc4.c
@@ -878,6 +878,8 @@ l_int32  n, x1, y1, x2, y2, x3, y3, x4, y4, x, y, xmax, ymax;
     if (!pta)
         return (BOX *)ERROR_PTR("pta not defined", __func__, NULL);
     n = ptaGetCount(pta);
+    if (n != 2 && n != 4)
+        return (BOX *)ERROR_PTR("n must be 2 or 4", __func__, NULL);
     ptaGetIPt(pta, 0, &x1, &y1);
     ptaGetIPt(pta, 1, &x2, &y2);
     if (n == 2)