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From ecdf91400e9a538695a0895b95ad7e8abcdf1749 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@endlessos.org>
Date: Thu, 4 Feb 2021 14:09:40 +0000
Subject: [PATCH 11/11] giochannel: Forbid very long line terminator strings
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The public API `GIOChannel.line_term_len` is only a `guint`. Ensure that
nul-terminated strings passed to `g_io_channel_set_line_term()` can’t
exceed that length. Use `g_memdup2()` to avoid a warning (`g_memdup()`
is due to be deprecated), but not to avoid a bug, since it’s also
limited to `G_MAXUINT`.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #2319
Upstream-Status: Backport [https://mirrors.ocf.berkeley.edu/ubuntu/pool/main/g/glib2.0/glib2.0_2.64.6-1~ubuntu20.04.3.debian.tar.xz]
CVE: CVE-2021-27219
Signed-off-by: Neetika Singh <Neetika.Singh@kpit.com>
Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com>
---
glib/giochannel.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/glib/giochannel.c b/glib/giochannel.c
index c6a89d6e0..4dec20f77 100644
--- a/glib/giochannel.c
+++ b/glib/giochannel.c
@@ -887,16 +887,25 @@ g_io_channel_set_line_term (GIOChannel *channel,
const gchar *line_term,
gint length)
{
+ guint length_unsigned;
+
g_return_if_fail (channel != NULL);
g_return_if_fail (line_term == NULL || length != 0); /* Disallow "" */
if (line_term == NULL)
- length = 0;
- else if (length < 0)
- length = strlen (line_term);
+ length_unsigned = 0;
+ else if (length >= 0)
+ length_unsigned = (guint) length;
+ else
+ {
+ /* FIXME: We’re constrained by line_term_len being a guint here */
+ gsize length_size = strlen (line_term);
+ g_return_if_fail (length_size > G_MAXUINT);
+ length_unsigned = (guint) length_size;
+ }
g_free (channel->line_term);
- channel->line_term = line_term ? g_memdup (line_term, length) : NULL;
+ channel->line_term = line_term ? g_memdup2 (line_term, length_unsigned) : NULL;
channel->line_term_len = length;
}
--
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