8380959: Update Libpng to 1.6.56

Reviewed-by: andrew
Backport-of: 77cfead

Author: GoeLin

make/modules/java.desktop/lib/ClientLibraries.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -256,6 +256,7 @@ ifeq ($(ENABLE_HEADLESS_ONLY), false)
       DISABLED_WARNINGS_microsoft_dgif_lib.c := 4018 4267, \
       DISABLED_WARNINGS_microsoft_splashscreen_impl.c := 4018 4267 4244, \
       DISABLED_WARNINGS_microsoft_splashscreen_png.c := 4267, \
+      DISABLED_WARNINGS_microsoft_pngread.c := 4146, \
       DISABLED_WARNINGS_microsoft_splashscreen_sys.c := 4267 4244, \
       LDFLAGS := $(ICONV_LDFLAGS), \
       LDFLAGS_windows := -delayload:user32.dll, \

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

@@ -1,4 +1,4 @@
-## libpng v1.6.55
+## libpng v1.6.56
 
 ### libpng License
 <pre>
@@ -168,6 +168,7 @@ Authors, for copyright and licensing purposes.
  * Glenn Randers-Pehrson
  * Greg Roelofs
  * Guy Eric Schalnat
+ * Halil Oktay
  * James Yu
  * John Bowler
  * Joshua Inscoe
@@ -187,12 +188,14 @@ Authors, for copyright and licensing purposes.
  * Sam Bushell
  * Samuel Williams
  * Simon-Pierre Cadieux
+ * Taegu Ha (하태구)
  * Tim Wegner
  * Tobias Stoeckmann
  * Tom Lane
  * Tom Tanner
  * Vadim Barkov
  * Willem van Schaik
+ * Yuelin Wang (王跃林)
  * Zhijie Liang
  * Apple Inc.
     - Zixu Wang (王子旭)

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

@@ -6337,6 +6337,37 @@ Version 1.6.55 [February 9, 2026]
   Resolved an oss-fuzz build issue involving nalloc.
     (Contributed by Philippe Antoine.)
 
+Version 1.6.56 [March 25, 2026]
+  Fixed CVE-2026-33416 (high severity):
+    Use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`.
+    (Reported by Halil Oktay and Ryo Shimada;
+    fixed by Halil Oktay and Cosmin Truta.)
+  Fixed CVE-2026-33636 (high severity):
+    Out-of-bounds read/write in the palette expansion on ARM Neon.
+    (Reported by Taegu Ha; fixed by Taegu Ha and Cosmin Truta.)
+  Fixed uninitialized reads beyond `num_trans` in `trans_alpha` buffers.
+    (Contributed by Halil Oktay.)
+  Fixed stale `info_ptr->palette` after in-place gamma and background
+    transforms.
+  Fixed wrong channel indices in `png_image_read_and_map` RGB_ALPHA path.
+    (Contributed by Yuelin Wang.)
+  Fixed wrong background color in colormap read.
+    (Contributed by Yuelin Wang.)
+  Fixed dead loop in sPLT write.
+    (Contributed by Yuelin Wang.)
+  Added missing null pointer checks in four public API functions.
+    (Contributed by Yuelin Wang.)
+  Validated shift bit depths in `png_set_shift` to prevent infinite loop.
+    (Contributed by Yuelin Wang.)
+  Avoided undefined behavior in library and tests.
+  Deprecated the hardly-ever-tested POINTER_INDEXING config option.
+  Added negative-stride test coverage for the simplified API.
+  Fixed memory leaks and API misuse in oss-fuzz.
+    (Contributed by Owen Sanzas.)
+  Implemented various fixes and improvements in oss-fuzz.
+    (Contributed by Bob Friesenhahn and Philippe Antoine.)
+  Performed various refactorings and cleanups.
+
 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>

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

@@ -1,4 +1,4 @@
-README for libpng version 1.6.55
+README for libpng version 1.6.56
 ================================
 
 See the note about version numbers near the top of `png.h`.

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_55 Your_png_h_is_not_version_1_6_55;
+typedef png_libpng_version_1_6_56 Your_png_h_is_not_version_1_6_56;
 
 /* 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 1.6.55" PNG_STRING_NEWLINE \
+      "libpng version 1.6.56" 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 \
@@ -1199,7 +1199,7 @@ png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ)
       return 1;
 
    /* The reference white is simply the sum of the end-point (X,Y,Z) vectors so
-    * the fillowing calculates (X+Y+Z) of the reference white (media white,
+    * the following calculates (X+Y+Z) of the reference white (media white,
     * encoding white) itself:
     */
    d = dblue;
@@ -1244,9 +1244,9 @@ png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
     * (-0.0770) because the PNG spec itself requires the xy values to be
     * unsigned.  whitey is also required to be 5 or more to avoid overflow.
     *
-    * Instead the upper limits have been relaxed to accomodate ACES AP1 where
+    * Instead the upper limits have been relaxed to accommodate ACES AP1 where
     * redz ends up as -600 (-0.006).  ProPhotoRGB was already "in range."
-    * The new limit accomodates the AP0 and AP1 ranges for z but not AP0 redy.
+    * The new limit accommodates the AP0 and AP1 ranges for z but not AP0 redy.
     */
    const png_fixed_point fpLimit = PNG_FP_1+(PNG_FP_1/10);
    if (xy->redx   < 0 || xy->redx > fpLimit) return 1;
@@ -1357,7 +1357,7 @@ png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
     *    red-scale + green-scale + blue-scale = 1/white-y = white-scale
     *
     * So now we have a Cramer's rule solution where the determinants are just
-    * 3x3 - far more tractible.  Unfortunately 3x3 determinants still involve
+    * 3x3 - far more tractable.  Unfortunately 3x3 determinants still involve
     * multiplication of three coefficients so we can't guarantee to avoid
     * overflow in the libpng fixed point representation.  Using Cramer's rule in
     * floating point is probably a good choice here, but it's not an option for
@@ -1726,7 +1726,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_const_charp name,
     * into R, G and B channels.
     *
     * Previously it was suggested that an RGB profile on grayscale data could be
-    * handled.  However it it is clear that using an RGB profile in this context
+    * handled.  However it is clear that using an RGB profile in this context
     * must be an error - there is no specification of what it means.  Thus it is
     * almost certainly more correct to ignore the profile.
     */
@@ -2944,7 +2944,7 @@ png_gamma_significant(png_fixed_point gamma_val)
     *
     *    2.2/(2+51/256) == 1.00035524
     *
-    * I.e. vanishly small (<4E-4) but still detectable in 16-bit linear (+/-
+    * I.e. vanishingly small (<4E-4) but still detectable in 16-bit linear (+/-
     * 23).  Note that the Adobe choice seems to be something intended to give an
     * exact number with 8 binary fractional digits - it is the closest to 2.2
     * that is possible a base 2 .8p representation.

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 1.6.55
+ * libpng version 1.6.56
  *
  * 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 1.6.55, February 2026:
+ *   libpng versions 1.6.36, December 2018, through 1.6.56, March 2026:
  *     Cosmin Truta
  *   See also "Contributing Authors", below.
  */
@@ -267,7 +267,7 @@
  *    ...
  *    1.5.30                  15    10530  15.so.15.30[.0]
  *    ...
- *    1.6.55                  16    10655  16.so.16.55[.0]
+ *    1.6.56                  16    10656  16.so.16.56[.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 "1.6.55"
+#define PNG_LIBPNG_VER_STRING "1.6.56"
 #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 55
+#define PNG_LIBPNG_VER_RELEASE 56
 
 /* 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 10655 /* 1.6.55 */
+#define PNG_LIBPNG_VER 10656 /* 1.6.56 */
 
 /* 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_55;
+typedef char *png_libpng_version_1_6_56;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
@@ -2370,7 +2370,7 @@ PNG_EXPORT(162, int, png_get_text,
 #endif
 
 /* Note while png_set_text() will accept a structure whose text,
- * language, and  translated keywords are NULL pointers, the structure
+ * language, and translated keywords are NULL pointers, the structure
  * returned by png_get_text will always contain regular
  * zero-terminated C strings.  They might be empty strings but
  * they will never be NULL pointers.

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 1.6.55
+ * libpng version 1.6.56
  *
  * 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 1.6.55 */
+/* libpng version 1.6.56 */
 
 /* Copyright (c) 2018-2026 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */

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

@@ -986,7 +986,7 @@
  *
  * At present these index values are not exported (not part of the public API)
  * so can be changed at will.  For convenience the names are in lexical sort
- * order but with the critical chunks at the start in the order of occurence in
+ * order but with the critical chunks at the start in the order of occurrence in
  * a PNG.
  *
  * PNG_INFO_ values do not exist for every one of these chunk handles; for
@@ -2115,7 +2115,7 @@ PNG_INTERNAL_FUNCTION(void, png_ascii_from_fixed,
  * not valid it will be the index of a character in the supposed number.
  *
  * The format of a number is defined in the PNG extensions specification
- * and this API is strictly conformant to that spec, not anyone elses!
+ * and this API is strictly conformant to that spec, not anyone else's!
  *
  * The format as a regular expression is:
  *