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From 6976bdc8ee9dd2c2954f91066f7b0f643769a379 Mon Sep 17 00:00:00 2001
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From: Robert Ancell <robert.ancell@canonical.com>
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Date: Thu, 3 Jun 2021 11:05:56 +1200
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Subject: [PATCH] gif: Check for overflow when compositing or clearing frames.
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Fixes: #190
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Similar to fix in 086e8adf4cc352cd11572f96066b001b545f354e
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---
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gdk-pixbuf/io-gif-animation.c | 21 +++++++++++++--------
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1 file changed, 13 insertions(+), 8 deletions(-)
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diff --git a/gdk-pixbuf/io-gif-animation.c b/gdk-pixbuf/io-gif-animation.c
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index 8335cdd76..71d9265e6 100644
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--- a/gdk-pixbuf/io-gif-animation.c
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+++ b/gdk-pixbuf/io-gif-animation.c
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@@ -369,7 +369,7 @@ composite_frame (GdkPixbufGifAnim *anim, GdkPixbufFrame *frame)
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for (i = 0; i < n_indexes; i++) {
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guint8 index = index_buffer[i];
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guint x, y;
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- int offset;
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+ gsize offset;
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if (index == frame->transparent_index)
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continue;
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@@ -379,11 +379,13 @@ composite_frame (GdkPixbufGifAnim *anim, GdkPixbufFrame *frame)
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if (x >= anim->width || y >= anim->height)
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continue;
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- offset = y * gdk_pixbuf_get_rowstride (anim->last_frame_data) + x * 4;
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- pixels[offset + 0] = frame->color_map[index * 3 + 0];
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- pixels[offset + 1] = frame->color_map[index * 3 + 1];
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- pixels[offset + 2] = frame->color_map[index * 3 + 2];
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- pixels[offset + 3] = 255;
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+ if (g_size_checked_mul (&offset, gdk_pixbuf_get_rowstride (anim->last_frame_data), y) &&
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+ g_size_checked_add (&offset, offset, x * 4)) {
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+ pixels[offset + 0] = frame->color_map[index * 3 + 0];
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+ pixels[offset + 1] = frame->color_map[index * 3 + 1];
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+ pixels[offset + 2] = frame->color_map[index * 3 + 2];
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+ pixels[offset + 3] = 255;
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+ }
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}
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out:
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@@ -448,8 +450,11 @@ gdk_pixbuf_gif_anim_iter_get_pixbuf (GdkPixbufAnimationIter *anim_iter)
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x_end = MIN (anim->last_frame->x_offset + anim->last_frame->width, anim->width);
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y_end = MIN (anim->last_frame->y_offset + anim->last_frame->height, anim->height);
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for (y = anim->last_frame->y_offset; y < y_end; y++) {
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- guchar *line = pixels + y * gdk_pixbuf_get_rowstride (anim->last_frame_data) + anim->last_frame->x_offset * 4;
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- memset (line, 0, (x_end - anim->last_frame->x_offset) * 4);
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+ gsize offset;
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+ if (g_size_checked_mul (&offset, gdk_pixbuf_get_rowstride (anim->last_frame_data), y) &&
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+ g_size_checked_add (&offset, offset, anim->last_frame->x_offset * 4)) {
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+ memset (pixels + offset, 0, (x_end - anim->last_frame->x_offset) * 4);
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+ }
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}
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break;
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case GDK_PIXBUF_FRAME_REVERT:
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--
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GitLab
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