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queuearray: Fix potential heap overflow when expanding GstQueueArray

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Check that elt_size*newsize doesn't overflow when expanding a
GstQueueArray, which has the potential for a heap overwrite.

Co-authored-by: Sebastian Dröge <sebastian@centricular.com>

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1232

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2607>
This commit is contained in:
Adam Doupe 2022-05-19 04:59:58 +00:00 committed by Tim-Philipp Müller
parent b6bb400f14
commit cc4b1b4e6e
1 changed files with 17 additions and 8 deletions
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25
subprojects/gstreamer/libs/gst/base/gstqueuearray.c
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@ -332,16 +332,24 @@ gst_queue_array_peek_nth_struct (GstQueueArray * array, guint idx)
static void
gst_queue_array_do_expand (GstQueueArray * array)
{
guint elt_size = array->elt_size;
gsize elt_size = array->elt_size;
/* newsize is 50% bigger */
guint oldsize = array->size;
guint newsize = MAX ((3 * oldsize) / 2, oldsize + 1);
gsize oldsize = array->size;
guint64 newsize;
newsize = MAX ((3 * (guint64) oldsize) / 2, (guint64) oldsize + 1);
if (newsize > G_MAXUINT)
g_error ("growing the queue array would overflow");
/* copy over data */
if (array->tail != 0) {
guint8 *array2 = g_malloc0 (elt_size * newsize);
guint t1 = array->head;
guint t2 = oldsize - array->head;
guint8 *array2 = NULL;
gsize t1 = 0;
gsize t2 = 0;
array2 = g_malloc0_n (newsize, elt_size);
t1 = array->head;
t2 = oldsize - array->head;
/* [0-----TAIL][HEAD------SIZE]
*
@ -352,7 +360,8 @@ gst_queue_array_do_expand (GstQueueArray * array)
* 2) move [0-------TAIL] part new array, after previous part
*/
memcpy (array2, array->array + (elt_size * array->head), t2 * elt_size);
memcpy (array2, array->array + (elt_size * (gsize) array->head),
t2 * elt_size);
memcpy (array2 + t2 * elt_size, array->array, t1 * elt_size);
g_free (array->array);
@ -360,7 +369,7 @@ gst_queue_array_do_expand (GstQueueArray * array)
array->head = 0;
} else {
/* Fast path, we just need to grow the array */
array->array = g_realloc (array->array, elt_size * newsize);
array->array = g_realloc_n (array->array, newsize, elt_size);
memset (array->array + elt_size * oldsize, 0,
elt_size * (newsize - oldsize));
}