From: Cristy <urban-warrior@imagemagick.org>
Date: Sun, 23 Sep 2018 17:40:24 +0000 (-0400)
Subject: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10410
X-Git-Tag: 7.0.8-13~90
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b68d087c0842404e89c6a467bb1fbdb13c45db03;p=imagemagick

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10410
---

diff --git a/coders/dcm.c b/coders/dcm.c
index 8a431c73c..84cfb0017 100644
--- a/coders/dcm.c
+++ b/coders/dcm.c
@@ -2875,7 +2875,7 @@ static MagickBooleanType ReadDCMPixels(Image *image,DCMInfo *info,
           else
             if ((info->bits_allocated != 12) || (info->significant_bits != 12))
               {
-                if (info->signed_data)
+                if (info->signed_data != 0)
                   pixel_value=ReadDCMSignedShort(stream_info,image);
                 else
                   pixel_value=(int) ReadDCMShort(stream_info,image);
@@ -2885,8 +2885,12 @@ static MagickBooleanType ReadDCMPixels(Image *image,DCMInfo *info,
             else
               {
                 if ((i & 0x01) != 0)
-                  pixel_value=(ReadDCMByte(stream_info,image) << 8) |
-                    byte;
+                  { 
+                    pixel_value=byte;
+                    byte=ReadDCMByte(stream_info,image);
+                    if (byte >= 0)  
+                      pixel_value|=(byte << 8);
+                  }
                 else
                   {
                     pixel_value=ReadDCMSignedShort(stream_info,image);