libpng: upgrade 1.6.55 -> 1.6.56

Release notes [1]:
 * 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.

[1] https://github.com/pnggroup/libpng/blob/v1.6.56/ANNOUNCE

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/recipes-multimedia/libpng/libpng_1.6.55.bb b/meta/recipes-multimedia/libpng/libpng_1.6.56.bb
similarity index 97%
rename from meta/recipes-multimedia/libpng/libpng_1.6.55.bb
rename to meta/recipes-multimedia/libpng/libpng_1.6.56.bb
index c6e95e072376176864ce72ec36fa14b42c4bcff7..7ede0a6c8b7ce69a531df61672769b28df176acd 100644 (file)
--- a/meta/recipes-multimedia/libpng/libpng_1.6.55.bb
+++ b/meta/recipes-multimedia/libpng/libpng_1.6.56.bb
@@ -14,7 +14,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/${BPN}/${BPN}${LIBV}/${BP}.tar.xz \
            file://run-ptest \
 "
 
-SRC_URI[sha256sum] = "d925722864837ad5ae2a82070d4b2e0603dc72af44bd457c3962298258b8e82d"
+SRC_URI[sha256sum] = "f7d8bf1601b7804f583a254ab343a6549ca6cf27d255c302c47af2d9d36a6f18"
 
 MIRRORS += "${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/ ${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/older-releases/"