8377526: Update Libpng to 1.6.55

Backport-of: fd74232
(cherry picked from commit 4a51260)

Author: jayathirthrao

src/java.desktop/share/legal/libpng.md

@@ -1,4 +1,4 @@
-## libpng v1.6.54
+## libpng v1.6.55
 
 ### libpng License
 <pre>
@@ -170,6 +170,7 @@ Authors, for copyright and licensing purposes.
  * Guy Eric Schalnat
  * James Yu
  * John Bowler
+ * Joshua Inscoe
  * Kevin Bracey
  * Lucas Chollet
  * Magnus Holmgren

src/java.desktop/share/native/libsplashscreen/libpng/CHANGES

@@ -5988,7 +5988,7 @@ Version 1.6.32rc01 [August 18, 2017]
 
 Version 1.6.32rc02 [August 22, 2017]
   Added contrib/oss-fuzz directory which contains files used by the oss-fuzz
-    project (https://github.com/google/oss-fuzz/tree/master/projects/libpng).
+    project <https://github.com/google/oss-fuzz/tree/master/projects/libpng>.
 
 Version 1.6.32 [August 24, 2017]
   No changes.
@@ -6323,15 +6323,21 @@ Version 1.6.53 [December 5, 2025]
 
 Version 1.6.54 [January 12, 2026]
   Fixed CVE-2026-22695 (medium severity):
-    Heap buffer over-read in `png_image_read_direct_scaled.
+    Heap buffer over-read in `png_image_read_direct_scaled`.
     (Reported and fixed by Petr Simecek.)
   Fixed CVE-2026-22801 (medium severity):
     Integer truncation causing heap buffer over-read in `png_image_write_*`.
   Implemented various improvements in oss-fuzz.
     (Contributed by Philippe Antoine.)
 
+Version 1.6.55 [February 9, 2026]
+  Fixed CVE-2026-25646 (high severity):
+    Heap buffer overflow in `png_set_quantize`.
+    (Reported and fixed by Joshua Inscoe.)
+  Resolved an oss-fuzz build issue involving nalloc.
+    (Contributed by Philippe Antoine.)
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.
 Subscription is required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+<https://lists.sourceforge.net/lists/listinfo/png-mng-implement>
 to subscribe.

src/java.desktop/share/native/libsplashscreen/libpng/README

@@ -1,4 +1,4 @@
-README for libpng version 1.6.54
+README for libpng version 1.6.55
 ================================
 
 See the note about version numbers near the top of `png.h`.
@@ -24,27 +24,27 @@ for more things than just PNG files.  You can use zlib as a drop-in
 replacement for `fread()` and `fwrite()`, if you are so inclined.
 
 zlib should be available at the same place that libpng is, or at
-https://zlib.net .
+<https://zlib.net>.
 
 You may also want a copy of the PNG specification.  It is available
 as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
-these at http://www.libpng.org/pub/png/pngdocs.html .
+these at <http://www.libpng.org/pub/png/pngdocs.html>.
 
-This code is currently being archived at https://libpng.sourceforge.io
-in the download area, and at http://libpng.download/src .
+This code is currently being archived at <https://libpng.sourceforge.io>
+in the download area, and at <http://libpng.download/src>.
 
 This release, based in a large way on Glenn's, Guy's and Andreas'
 earlier work, was created and will be supported by myself and the PNG
 development group.
 
 Send comments, corrections and commendations to `png-mng-implement`
 at `lists.sourceforge.net`.  (Subscription is required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+<https://lists.sourceforge.net/lists/listinfo/png-mng-implement>
 to subscribe.)
 
 Send general questions about the PNG specification to `png-mng-misc`
 at `lists.sourceforge.net`.  (Subscription is required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-misc
+<https://lists.sourceforge.net/lists/listinfo/png-mng-misc>
 to subscribe.)
 
 Historical notes

src/java.desktop/share/native/libsplashscreen/libpng/png.c

@@ -42,7 +42,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_54 Your_png_h_is_not_version_1_6_54;
+typedef png_libpng_version_1_6_55 Your_png_h_is_not_version_1_6_55;
 
 /* Sanity check the chunks definitions - PNG_KNOWN_CHUNKS from pngpriv.h and the
  * corresponding macro definitions.  This causes a compile time failure if
@@ -849,7 +849,7 @@ png_get_copyright(png_const_structrp png_ptr)
    return PNG_STRING_COPYRIGHT
 #else
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.54" PNG_STRING_NEWLINE \
+      "libpng version 1.6.55" PNG_STRING_NEWLINE \
       "Copyright (c) 2018-2026 Cosmin Truta" PNG_STRING_NEWLINE \
       "Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson" \
       PNG_STRING_NEWLINE \

src/java.desktop/share/native/libsplashscreen/libpng/png.h

@@ -29,7 +29,7 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  *
- * libpng version 1.6.54
+ * libpng version 1.6.55
  *
  * Copyright (c) 2018-2026 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
@@ -43,7 +43,7 @@
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
  *   libpng versions 0.97, January 1998, through 1.6.35, July 2018:
  *     Glenn Randers-Pehrson
- *   libpng versions 1.6.36, December 2018, through 1.6.54, January 2026:
+ *   libpng versions 1.6.36, December 2018, through 1.6.55, February 2026:
  *     Cosmin Truta
  *   See also "Contributing Authors", below.
  */
@@ -267,7 +267,7 @@
  *    ...
  *    1.5.30                  15    10530  15.so.15.30[.0]
  *    ...
- *    1.6.54                  16    10654  16.so.16.54[.0]
+ *    1.6.55                  16    10655  16.so.16.55[.0]
  *
  *    Henceforth the source version will match the shared-library major and
  *    minor numbers; the shared-library major version number will be used for
@@ -303,7 +303,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.54"
+#define PNG_LIBPNG_VER_STRING "1.6.55"
 #define PNG_HEADER_VERSION_STRING " libpng version " PNG_LIBPNG_VER_STRING "\n"
 
 /* The versions of shared library builds should stay in sync, going forward */
@@ -314,7 +314,7 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   6
-#define PNG_LIBPNG_VER_RELEASE 54
+#define PNG_LIBPNG_VER_RELEASE 55
 
 /* This should be zero for a public release, or non-zero for a
  * development version.
@@ -345,7 +345,7 @@
  * From version 1.0.1 it is:
  * XXYYZZ, where XX=major, YY=minor, ZZ=release
  */
-#define PNG_LIBPNG_VER 10654 /* 1.6.54 */
+#define PNG_LIBPNG_VER 10655 /* 1.6.55 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -455,7 +455,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char *png_libpng_version_1_6_54;
+typedef char *png_libpng_version_1_6_55;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *

src/java.desktop/share/native/libsplashscreen/libpng/pngconf.h

@@ -29,7 +29,7 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  *
- * libpng version 1.6.54
+ * libpng version 1.6.55
  *
  * Copyright (c) 2018-2026 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson

src/java.desktop/share/native/libsplashscreen/libpng/pnglibconf.h

@@ -31,7 +31,7 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  */
-/* libpng version 1.6.54 */
+/* libpng version 1.6.55 */
 
 /* Copyright (c) 2018-2026 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */

src/java.desktop/share/native/libsplashscreen/libpng/pngrtran.c

@@ -29,7 +29,7 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  *
- * Copyright (c) 2018-2025 Cosmin Truta
+ * Copyright (c) 2018-2026 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
  * Copyright (c) 1996-1997 Andreas Dilger
  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@@ -737,8 +737,8 @@ png_set_quantize(png_structrp png_ptr, png_colorp palette,
                          break;
 
                      t->next = hash[d];
-                     t->left = (png_byte)i;
-                     t->right = (png_byte)j;
+                     t->left = png_ptr->palette_to_index[i];
+                     t->right = png_ptr->palette_to_index[j];
                      hash[d] = t;
                   }
                }