File GraphicsMagick-CVE-2017-13063,13064,13065.patch of Package GraphicsMagick.7727

Index: GraphicsMagick-1.3.25/coders/svg.c
===================================================================
--- GraphicsMagick-1.3.25.orig/coders/svg.c	2016-09-05 21:20:23.000000000 +0200
+++ GraphicsMagick-1.3.25/coders/svg.c	2017-10-20 12:39:35.106109960 +0200
@@ -266,11 +266,12 @@ static char **GetStyleTokens(void *conte
   char
     **tokens;
 
-  register const char
+  const char
     *p,
     *q;
 
-  register size_t
+  size_t
+    alloc_tokens,
     i;
 
   SVGInfo
@@ -278,21 +279,27 @@ static char **GetStyleTokens(void *conte
 
   svg_info=(SVGInfo *) context;
   *number_tokens=0;
+  alloc_tokens=0;
   if (text == (const char *) NULL)
     return((char **) NULL);
   /*
     Determine the number of arguments.
+
+    style="fill: red; stroke: blue; stroke-width: 3"
   */
   for (p=text; *p != '\0'; p++)
     if (*p == ':')
-      (*number_tokens)+=2;
-  tokens=MagickAllocateMemory(char **,(*number_tokens+2)*sizeof(*tokens));
+      alloc_tokens+=2;
+  if (alloc_tokens == 0)
+    return((char **) NULL);
+  tokens=MagickAllocateMemory(char **,(alloc_tokens+2)*sizeof(*tokens));
   if (tokens == (char **) NULL)
     {
       ThrowException3(svg_info->exception,ResourceLimitError,
         MemoryAllocationFailed,UnableToConvertStringToTokens);
       return((char **) NULL);
     }
+  (void) memset(tokens,0,(alloc_tokens+2)*sizeof(*tokens));
   /*
     Convert string to an ASCII list.
   */
@@ -303,14 +310,36 @@ static char **GetStyleTokens(void *conte
     if ((*q != ':') && (*q != ';') && (*q != '\0'))
       continue;
     tokens[i]=AllocateString(p);
+      if (tokens[i] == NULL)
+        {
+          ThrowException3(svg_info->exception,ResourceLimitError,
+                          MemoryAllocationFailed,UnableToConvertStringToTokens);
+          break;
+        }
     (void) strlcpy(tokens[i],p,q-p+1);
-    Strip(tokens[i++]);
+      Strip(tokens[i]);
+      i++;
+      if (i >= alloc_tokens)
+        break;
     p=q+1;
   }
-  tokens[i]=AllocateString(p);
-  (void) strlcpy(tokens[i],p,q-p+1);
-  Strip(tokens[i++]);
+  if (i < alloc_tokens)
+    {
+      tokens[i]=AllocateString(p);
+      if (tokens[i] == NULL)
+        {
+          ThrowException3(svg_info->exception,ResourceLimitError,
+                          MemoryAllocationFailed,UnableToConvertStringToTokens);
+        }
+      else
+        {
+          (void) strlcpy(tokens[i],p,q-p+1);
+          Strip(tokens[i]);
+          i++;
+        }
+    }
   tokens[i]=(char *) NULL;
+  *number_tokens=i;
   return(tokens);
 }
 
@@ -1555,6 +1584,8 @@ static void SVGStartElement(void *contex
             {
               (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  ");
               tokens=GetStyleTokens(context,value,&number_tokens);
+              if ((tokens != (char **) NULL) && (number_tokens > 0))
+              {
               for (j=0; j < (number_tokens-1); j+=2)
               {
                 keyword=(char *) tokens[j];
@@ -1775,9 +1806,13 @@ static void SVGStartElement(void *contex
                     break;
                 }
               }
+              }
+              if (tokens != (char **) NULL)
+              {
               for (j=0; tokens[j] != (char *) NULL; j++)
                 MagickFreeMemory(tokens[j]);
               MagickFreeMemory(tokens);
+              }
               break;
             }
           break;