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gmarkup: Avoid reading off the end of a buffer when non-nul-terminated

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When extracting a UTF-8 character to put in an error message on parse
failure, pass the remaining buffer length to utf8_str() to avoid it
running off the end of the input buffer. It previously assumed that the
buffer was nul-terminated, which was the case in all the tests until
now.

A following commit will add test coverage for this.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Philip Withnall 2018-10-26 23:06:37 +13:00
parent 29c1b6e72c
commit 8cfe53f081
1 changed files with 20 additions and 10 deletions
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30
glib/gmarkup.c
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@ -563,12 +563,14 @@ char_str (gunichar c,
* emitting it as hex escapes. */
static gchar*
utf8_str (const gchar *utf8,
gsize max_len,
gchar *buf)
{
gunichar c = g_utf8_get_char_validated (utf8, -1);
gunichar c = g_utf8_get_char_validated (utf8, max_len);
if (c == (gunichar) -1 || c == (gunichar) -2)
{
gchar *temp = g_strdup_printf ("\\x%02x", (guint)(guchar)*utf8);
guchar ch = (max_len > 0) ? (guchar) *utf8 : 0;
gchar *temp = g_strdup_printf ("\\x%02x", (guint) ch);
memset (buf, 0, 8);
memcpy (buf, temp, strlen (temp));
g_free (temp);
@ -1223,7 +1225,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
_("“%s” is not a valid character following "
"a “<” character; it may not begin an "
"element name"),
utf8_str (context->iter, buf));
utf8_str (context->iter,
context->current_text_end - context->iter, buf));
}
break;
@ -1264,7 +1267,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
G_MARKUP_ERROR_PARSE,
_("Odd character “%s”, expected a “>” character "
"to end the empty-element tag “%s”"),
utf8_str (context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
current_element (context));
}
break;
@ -1345,7 +1349,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
G_MARKUP_ERROR_PARSE,
_("Odd character “%s”, expected a “=” after "
"attribute name “%s” of element “%s”"),
utf8_str (context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
current_attribute (context),
current_element (context));
@ -1389,7 +1394,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
"element “%s”, or optionally an attribute; "
"perhaps you used an invalid character in "
"an attribute name"),
utf8_str (context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
current_element (context));
}
@ -1431,7 +1437,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
_("Odd character “%s”, expected an open quote mark "
"after the equals sign when giving value for "
"attribute “%s” of element “%s”"),
utf8_str (context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
current_attribute (context),
current_element (context));
}
@ -1564,8 +1571,10 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
_("“%s” is not a valid character following "
"the characters “</”; “%s” may not begin an "
"element name"),
utf8_str (context->iter, buf),
utf8_str (context->iter, buf));
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf));
}
break;
@ -1600,7 +1609,8 @@ g_markup_parse_context_parse (GMarkupParseContext *context,
_("“%s” is not a valid character following "
"the close element name “%s”; the allowed "
"character is “>”"),
utf8_str (context->iter, buf),
utf8_str (context->iter,
context->current_text_end - context->iter, buf),
close_name->str);
}
else if (context->tag_stack == NULL)