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typefind: Avoid overflow calculation

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The qt typefinder uses guint64 values for offset and size calculation
but the typefinder system only supports gint64 values.

Make sure we don't end up using potentially overflowing values.
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Edward Hervey 2017-12-08 08:00:07 +01:00 committed by Edward Hervey
parent 6e770e0ebb
commit 1df9b05f18
1 changed files with 4 additions and 0 deletions
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4
gst/typefind/gsttypefindfunctions.c
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@ -3358,6 +3358,8 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
}
size = GST_READ_UINT32_BE (data);
if (size + offset >= G_MAXINT64)
break;
/* check compatible brands rather than ever expaning major brands above */
if ((STRNCMP (&data[4], "ftyp", 4) == 0) && (size >= 16)) {
data = gst_type_find_peek (tf, offset, size);
@ -3393,6 +3395,8 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
new_offset = offset + size;
if (new_offset <= offset)
break;
if (new_offset + 16 >= G_MAXINT64)
break;
offset = new_offset;
}