gdk-pixbuf: CVE-2021-46829 a heap-based buffer overflow

Source: https://gitlab.gnome.org/GNOME/gdk-pixbuf
MR: 120380
Type: Security Fix
Disposition: Backport from https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/5398f04d772f7f8baf5265715696ed88db0f0512


ChangeID: d8a843bcf97268ee4f0c6870f1339790a9a908e5
Description:
         CVE-2021-46829 gdk-pixbuf: a heap-based buffer overflow when compositing or clearing frames in GIF files.

(From OE-Core rev: ef3f5fba3c3b5e8b16d6b8b7721468e61c65f72f)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gdk-pixbuf/gdk-pixbuf/CVE-2021-46829.patch

+From bdf3a2630c02a63803309cf0ad4b274234c814ce Mon Sep 17 00:00:00 2001
+From: Hitendra Prajapati <hprajapati@mvista.com>
+Date: Tue, 9 Aug 2022 09:45:42 +0530
+Subject: [PATCH] CVE-2021-46829
+
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/5398f04d772f7f8baf5265715696ed88db0f0512]
+CVE: CVE-2021-46829
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ gdk-pixbuf/io-gif-animation.c | 21 +++++++++++++--------
+ 1 file changed, 13 insertions(+), 8 deletions(-)
+
+diff --git a/gdk-pixbuf/io-gif-animation.c b/gdk-pixbuf/io-gif-animation.c
+index d742963..9544391 100644
+--- a/gdk-pixbuf/io-gif-animation.c
++++ b/gdk-pixbuf/io-gif-animation.c
+@@ -364,7 +364,7 @@ composite_frame (GdkPixbufGifAnim *anim, GdkPixbufFrame *frame)
+         for (i = 0; i < n_indexes; i++) {
+                 guint8 index = index_buffer[i];
+                 guint x, y;
+-                int offset;
++                gsize offset;
+ 
+                 if (index == frame->transparent_index)
+                         continue;
+@@ -374,11 +374,13 @@ composite_frame (GdkPixbufGifAnim *anim, GdkPixbufFrame *frame)
+                 if (x >= anim->width || y >= anim->height)
+                         continue;
+ 
+-                offset = y * gdk_pixbuf_get_rowstride (anim->last_frame_data) + x * 4;
+-                pixels[offset + 0] = frame->color_map[index * 3 + 0];
+-                pixels[offset + 1] = frame->color_map[index * 3 + 1];
+-                pixels[offset + 2] = frame->color_map[index * 3 + 2];
+-                pixels[offset + 3] = 255;
++                if (g_size_checked_mul (&offset, gdk_pixbuf_get_rowstride (anim->last_frame_data), y) &&
++                    g_size_checked_add (&offset, offset, x * 4)) {
++                        pixels[offset + 0] = frame->color_map[index * 3 + 0];
++                        pixels[offset + 1] = frame->color_map[index * 3 + 1];
++                        pixels[offset + 2] = frame->color_map[index * 3 + 2];
++                        pixels[offset + 3] = 255;
++                }
+         }
+ 
+ out:
+@@ -443,8 +445,11 @@ gdk_pixbuf_gif_anim_iter_get_pixbuf (GdkPixbufAnimationIter *anim_iter)
+                         x_end = MIN (anim->last_frame->x_offset + anim->last_frame->width, anim->width);
+                         y_end = MIN (anim->last_frame->y_offset + anim->last_frame->height, anim->height);
+                         for (y = anim->last_frame->y_offset; y < y_end; y++) {
+-                                guchar *line = pixels + y * gdk_pixbuf_get_rowstride (anim->last_frame_data) + anim->last_frame->x_offset * 4;
+-                                memset (line, 0, (x_end - anim->last_frame->x_offset) * 4);
++                                gsize offset;
++                                if (g_size_checked_mul (&offset, gdk_pixbuf_get_rowstride (anim->last_frame_data), y) &&
++                                    g_size_checked_add (&offset, offset, anim->last_frame->x_offset * 4)) {
++                                         memset (pixels + offset, 0, (x_end - anim->last_frame->x_offset) * 4);
++                                }
+                         }
+                         break;
+                 case GDK_PIXBUF_FRAME_REVERT:
+-- 
+2.25.1
+

meta/recipes-gnome/gdk-pixbuf/gdk-pixbuf_2.40.0.bb

@@ -26,6 +26,7 @@ SRC_URI = "${GNOME_MIRROR}/${BPN}/${MAJ_VER}/${BPN}-${PV}.tar.xz \
            file://missing-test-data.patch \
            file://CVE-2020-29385.patch \
            file://CVE-2021-20240.patch \
+           file://CVE-2021-46829.patch \
            "
 
 SRC_URI_append_class-target = " \