The following issue has been found by Coverity static analysis tool.

Error: FORWARD_NULL (CWE-476): [#def5]

gd-2.0.35/gd_topal.c:1790: assign_zero: Assigning: "cquantize" = "NULL".

gd-2.0.35/gd_topal.c:1798: cond_false: Condition "cimP", taking false branch

gd-2.0.35/gd_topal.c:1804: else_branch: Reached else branch

gd-2.0.35/gd_topal.c:1807: cond_false: Condition "!oim->trueColor", taking false branch

gd-2.0.35/gd_topal.c:1815: if_end: End of if statement

gd-2.0.35/gd_topal.c:1819: cond_true: Condition "oim->transparent >= 0", taking true branch

gd-2.0.35/gd_topal.c:1823: cond_true: Condition "colorsWanted > maxColors", taking true branch

gd-2.0.35/gd_topal.c:1827: cond_true: Condition "!cimP", taking true branch

gd-2.0.35/gd_topal.c:1829: cond_false: Condition "!nim->pixels", taking false branch

gd-2.0.35/gd_topal.c:1833: if_end: End of if statement

gd-2.0.35/gd_topal.c:1834: cond_true: Condition "i < nim->sy", taking true branch

gd-2.0.35/gd_topal.c:1837: cond_true: Condition "!nim->pixels[i]", taking true branch

gd-2.0.35/gd_topal.c:1839: goto: Jumping to label "outOfMemory"

gd-2.0.35/gd_topal.c:2027: label: Reached label "outOfMemory"

gd-2.0.35/gd_topal.c:2028: cond_true: Condition "oim->trueColor", taking true branch

gd-2.0.35/gd_topal.c:2030: cond_true: Condition "!cimP", taking true branch

gd-2.0.35/gd_topal.c:2032: cond_true: Condition "i < nim->sy", taking true branch

gd-2.0.35/gd_topal.c:2034: cond_true: Condition "nim->pixels[i]", taking true branch

gd-2.0.35/gd_topal.c:2038: loop: Jumping back to the beginning of the loop

gd-2.0.35/gd_topal.c:2032: loop_begin: Jumped back to beginning of loop

gd-2.0.35/gd_topal.c:2032: cond_true: Condition "i < nim->sy", taking true branch

gd-2.0.35/gd_topal.c:2034: cond_true: Condition "nim->pixels[i]", taking true branch

gd-2.0.35/gd_topal.c:2038: loop: Jumping back to the beginning of the loop

gd-2.0.35/gd_topal.c:2032: loop_begin: Jumped back to beginning of loop

gd-2.0.35/gd_topal.c:2032: cond_false: Condition "i < nim->sy", taking false branch

gd-2.0.35/gd_topal.c:2038: loop_end: Reached end of loop

gd-2.0.35/gd_topal.c:2039: cond_true: Condition "nim->pixels", taking true branch

gd-2.0.35/gd_topal.c:2044: if_fallthrough: Falling through to end of if statement

gd-2.0.35/gd_topal.c:2047: if_end: End of if statement

gd-2.0.35/gd_topal.c:2050: cond_true: Condition "i < (32 /* 1 << 5 */)", taking true branch

gd-2.0.35/gd_topal.c:2052: var_deref_op: Dereferencing null pointer "cquantize".

Error: FORWARD_NULL (CWE-476): [#def6]

gd-2.0.35/gd_topal.c:1798: cond_true: Condition "cimP", taking true branch

gd-2.0.35/gd_topal.c:1801: cond_false: Condition "!nim", taking false branch

gd-2.0.35/gd_topal.c:1803: if_end: End of if statement

gd-2.0.35/gd_topal.c:1804: if_fallthrough: Falling through to end of if statement

gd-2.0.35/gd_topal.c:1806: if_end: End of if statement

gd-2.0.35/gd_topal.c:1807: cond_false: Condition "!oim->trueColor", taking false branch

gd-2.0.35/gd_topal.c:1815: if_end: End of if statement

gd-2.0.35/gd_topal.c:1819: cond_true: Condition "oim->transparent >= 0", taking true branch

gd-2.0.35/gd_topal.c:1823: cond_true: Condition "colorsWanted > maxColors", taking true branch

gd-2.0.35/gd_topal.c:1827: cond_false: Condition "!cimP", taking false branch

gd-2.0.35/gd_topal.c:1842: if_end: End of if statement

gd-2.0.35/gd_topal.c:1857: cond_true: Condition "!cquantize", taking true branch

gd-2.0.35/gd_topal.c:1857: var_compare_op: Comparing "cquantize" to null implies that "cquantize" might be null.

gd-2.0.35/gd_topal.c:1860: goto: Jumping to label "outOfMemory"

gd-2.0.35/gd_topal.c:2027: label: Reached label "outOfMemory"

gd-2.0.35/gd_topal.c:2028: cond_true: Condition "oim->trueColor", taking true branch

gd-2.0.35/gd_topal.c:2030: cond_false: Condition "!cimP", taking false branch

gd-2.0.35/gd_topal.c:2044: else_branch: Reached else branch

gd-2.0.35/gd_topal.c:2050: cond_true: Condition "i < (32 /* 1 << 5 */)", taking true branch

gd-2.0.35/gd_topal.c:2052: var_deref_op: Dereferencing null pointer "cquantize".

Error: FORWARD_NULL (CWE-476): [#def7]

gd-2.0.35/gd_topal.c:1798: cond_false: Condition "cimP", taking false branch

gd-2.0.35/gd_topal.c:1804: else_branch: Reached else branch

gd-2.0.35/gd_topal.c:1807: cond_false: Condition "!oim->trueColor", taking false branch

gd-2.0.35/gd_topal.c:1815: if_end: End of if statement

gd-2.0.35/gd_topal.c:1819: cond_true: Condition "oim->transparent >= 0", taking true branch

gd-2.0.35/gd_topal.c:1823: cond_true: Condition "colorsWanted > maxColors", taking true branch

gd-2.0.35/gd_topal.c:1827: cond_true: Condition "!cimP", taking true branch

gd-2.0.35/gd_topal.c:1829: cond_true: Condition "!nim->pixels", taking true branch

gd-2.0.35/gd_topal.c:1829: var_compare_op: Comparing "nim->pixels" to null implies that "nim->pixels" might be null.

gd-2.0.35/gd_topal.c:1832: goto: Jumping to label "outOfMemory"

gd-2.0.35/gd_topal.c:2027: label: Reached label "outOfMemory"

gd-2.0.35/gd_topal.c:2028: cond_true: Condition "oim->trueColor", taking true branch

gd-2.0.35/gd_topal.c:2030: cond_true: Condition "!cimP", taking true branch

gd-2.0.35/gd_topal.c:2032: cond_true: Condition "i < nim->sy", taking true branch

gd-2.0.35/gd_topal.c:2034: var_deref_op: Dereferencing null pointer "nim->pixels".

diff -up gd-2.0.35/gd_topal.c.sa4 gd-2.0.35/gd_topal.c

--- gd-2.0.35/gd_topal.c.sa4	2012-12-10 13:30:19.666363149 +0100

+++ gd-2.0.35/gd_topal.c	2012-12-10 13:37:50.550729535 +0100

@@ -2029,15 +2029,15 @@ outOfMemory:

     {

       if (!cimP) {

         /* On failure only */

-        for (i = 0; i < nim->sy; i++)

-  	{

-  	  if (nim->pixels[i])

-  	    {

-  	      gdFree (nim->pixels[i]);

-  	    }

-  	}

         if (nim->pixels)

   	{

+          for (i = 0; i < nim->sy; i++)

+  	  {

+  	    if (nim->pixels[i])

+  	      {

+  	        gdFree (nim->pixels[i]);

+  	      }

+  	  }

   	  gdFree (nim->pixels);

   	}

         nim->pixels = 0;

@@ -2047,27 +2047,27 @@ outOfMemory:

       }

     }

 success:

-  for (i = 0; i < HIST_C0_ELEMS; i++)

-    {

-      if (cquantize->histogram[i])

-	{

-	  gdFree (cquantize->histogram[i]);

-	}

-    }

-  if (cquantize->histogram)

-    {

-      gdFree (cquantize->histogram);

-    }

-  if (cquantize->fserrors)

-    {

-      gdFree (cquantize->fserrors);

-    }

-  if (cquantize->error_limiter_storage)

-    {

-      gdFree (cquantize->error_limiter_storage);

-    }

   if (cquantize)

     {

+      for (i = 0; i < HIST_C0_ELEMS; i++)

+        {

+          if (cquantize->histogram[i])

+	    {

+	      gdFree (cquantize->histogram[i]);

+	    }

+        }

+      if (cquantize->histogram)

+        {

+          gdFree (cquantize->histogram);

+        }

+      if (cquantize->fserrors)

+        {

+          gdFree (cquantize->fserrors);

+        }

+      if (cquantize->error_limiter_storage)

+        {

+          gdFree (cquantize->error_limiter_storage);

+        }

       gdFree (cquantize);

     }