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qtdemux: Fix out of bounds read in tag parsing code

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We can't simply assume that the length of the tag value as given
inside the stream is correct but should also check against the amount of
data we have actually available.

https://bugzilla.gnome.org/show_bug.cgi?id=775451
This commit is contained in:
Sebastian Dröge 2016-12-01 13:32:22 +02:00
parent 50e7096a86
commit d0949baf3d
1 changed files with 2 additions and 2 deletions
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4
gst/isomp4/qtdemux.c
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@ -11767,7 +11767,7 @@ qtdemux_tag_add_str_full (GstQTDemux * qtdemux, GstTagList * taglist,
} else {
len = QT_UINT32 (node->data);
type = QT_UINT32 ((guint8 *) node->data + 4);
if ((type >> 24) == 0xa9) {
if ((type >> 24) == 0xa9 && len > 8 + 4) {
gint str_len;
gint lang_code;
@ -11786,7 +11786,7 @@ qtdemux_tag_add_str_full (GstQTDemux * qtdemux, GstTagList * taglist,
}
offset = 12;
len = str_len + 8 + 4; /* remove trailing strings that we don't use */
len = MIN (len, str_len + 8 + 4); /* remove trailing strings that we don't use */
GST_DEBUG_OBJECT (qtdemux, "found international text tag");
if (lang_code < 0x800) { /* MAC encoded string */