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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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be11a6e26b
Check that width*height*sizeof(guint32) doesn't overflow when allocated user_data for mask, potential for heap overwrite when inverting. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1231 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2603>
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstmask.h"
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#include "paint.h"
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static GList *masks = NULL;
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void
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_gst_mask_init (void)
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{
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_gst_barboxwipes_register ();
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}
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static gint
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gst_mask_compare (GstMaskDefinition * def1, GstMaskDefinition * def2)
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{
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return (def1->type - def2->type);
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}
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void
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_gst_mask_register (const GstMaskDefinition * definition)
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{
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masks =
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g_list_insert_sorted (masks, (gpointer) definition,
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(GCompareFunc) gst_mask_compare);
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}
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const GList *
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gst_mask_get_definitions (void)
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{
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return masks;
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}
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static GstMaskDefinition *
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gst_mask_find_definition (gint type)
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{
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GList *walk = masks;
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while (walk) {
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GstMaskDefinition *def = (GstMaskDefinition *) walk->data;
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if (def->type == type)
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return def;
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walk = g_list_next (walk);
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}
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return NULL;
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}
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GstMask *
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gst_mask_factory_new (gint type, gboolean invert, gint bpp, gint width,
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gint height)
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{
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GstMaskDefinition *definition;
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GstMask *mask = NULL;
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definition = gst_mask_find_definition (type);
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if (definition) {
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mask = g_new0 (GstMask, 1);
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mask->type = definition->type;
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mask->bpp = bpp;
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mask->width = width;
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mask->height = height;
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mask->destroy_func = definition->destroy_func;
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mask->user_data = definition->user_data;
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if (((guint64) width * (guint64) height * sizeof (guint32)) > G_MAXUINT) {
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GST_WARNING ("width x height overflows");
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g_free (mask);
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return NULL;
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}
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mask->data = g_malloc (width * height * sizeof (guint32));
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definition->draw_func (mask);
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if (invert) {
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gint i, j;
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guint32 *datap = mask->data;
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guint32 max = (1 << bpp);
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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*datap = max - *datap;
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datap++;
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}
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}
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}
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}
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return mask;
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}
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void
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_gst_mask_default_destroy (GstMask * mask)
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{
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g_free (mask->data);
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g_free (mask);
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}
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void
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gst_mask_destroy (GstMask * mask)
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{
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if (mask->destroy_func)
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mask->destroy_func (mask);
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}
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