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typefind/xdgmime: Validate mimetypes to be valid GstStructure names before using them

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On macOS, for example, "text/*" can be returned as mimetype for
plaintext files but we don't allow '*' in structure names and this would
cause critical warnings.

It's a valid mimetype but not a valid structure name.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/616

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/875>
This commit is contained in:
Sebastian Dröge 2020-10-17 10:42:49 +03:00
parent 967e650937
commit 3036521fb6
1 changed files with 26 additions and 0 deletions
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26
gst/typefind/gsttypefindfunctions.c
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@ -5404,6 +5404,26 @@ vivo_type_find (GstTypeFind * tf, gpointer unused)
/*** XDG MIME typefinder (to avoid false positives mostly) ***/
#ifdef USE_GIO
static gboolean
xdgmime_validate_name (const gchar * name)
{
const gchar *s;
if (G_UNLIKELY (!g_ascii_isalpha (*name))) {
return FALSE;
}
/* FIXME: test name string more */
s = &name[1];
while (*s && (g_ascii_isalnum (*s) || strchr ("/-_.:+", *s) != NULL))
s++;
if (G_UNLIKELY (*s != '\0')) {
return FALSE;
}
return TRUE;
}
static void
xdgmime_typefind (GstTypeFind * find, gpointer user_data)
{
@ -5448,6 +5468,12 @@ xdgmime_typefind (GstTypeFind * find, gpointer user_data)
return;
}
if (!xdgmime_validate_name (mimetype)) {
GST_LOG ("Ignoring mimetype with invalid structure name");
g_free (mimetype);
return;
}
/* Again, we mainly want the xdg typefinding to prevent false-positives on
* non-media formats, so suggest the type with a probability that trumps
* uncertain results of our typefinders, but not more than that. */