From 30ccf9a0da1f47161b5935a95be854fe84e6c2a2 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Sat, 27 Aug 2022 08:38:57 -0400
Subject: [PATCH] squash heap-buffer-overflow, PoC TIFF from Hardik

---
 coders/tiff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/coders/tiff.c b/coders/tiff.c
index 132008efbf..a166bea177 100644
--- a/coders/tiff.c
+++ b/coders/tiff.c
@@ -1892,7 +1892,7 @@ static Image *ReadTIFFImage(const ImageInfo *image_info,
         /*
           Convert stripped TIFF image.
         */
-        extent=4*(samples_per_pixel+1)*TIFFStripSize(tiff);
+        extent=4*((image->depth+7)/8)*(samples_per_pixel+1)*TIFFStripSize(tiff);
         strip_pixels=(unsigned char *) AcquireQuantumMemory(extent,
           sizeof(*strip_pixels));
         if (strip_pixels == (unsigned char *) NULL)