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From 03c91c76daf70ee227f38304c5e45a155f45073d Mon Sep 17 00:00:00 2001
From: Dan Winship <danw@gnome.org>
Date: Thu, 3 Aug 2017 09:56:43 -0400
Subject: Fix chunked decoding buffer overrun (CVE-2017-2885)
https://bugzilla.gnome.org/show_bug.cgi?id=785774
---
libsoup/soup-filter-input-stream.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/libsoup/soup-filter-input-stream.c b/libsoup/soup-filter-input-stream.c
index cde4d12..2c30bf9 100644
--- a/libsoup/soup-filter-input-stream.c
+++ b/libsoup/soup-filter-input-stream.c
@@ -198,7 +198,7 @@ soup_filter_input_stream_read_until (SoupFilterInputStream *fstream,
GCancellable *cancellable,
GError **error)
{
- gssize nread;
+ gssize nread, read_length;
guint8 *p, *buf, *end;
gboolean eof = FALSE;
GError *my_error = NULL;
@@ -251,10 +251,11 @@ soup_filter_input_stream_read_until (SoupFilterInputStream *fstream,
} else
buf = fstream->priv->buf->data;
- /* Scan for the boundary */
- end = buf + fstream->priv->buf->len;
- if (!eof)
- end -= boundary_length;
+ /* Scan for the boundary within the range we can possibly return. */
+ if (include_boundary)
+ end = buf + MIN (fstream->priv->buf->len, length) - boundary_length;
+ else
+ end = buf + MIN (fstream->priv->buf->len - boundary_length, length);
for (p = buf; p <= end; p++) {
if (*p == *(guint8*)boundary &&
!memcmp (p, boundary, boundary_length)) {
@@ -268,10 +269,9 @@ soup_filter_input_stream_read_until (SoupFilterInputStream *fstream,
if (!*got_boundary && fstream->priv->buf->len < length && !eof)
goto fill_buffer;
- /* Return everything up to 'p' (which is either just after the boundary if
- * include_boundary is TRUE, just before the boundary if include_boundary is
- * FALSE, @boundary_len - 1 bytes before the end of the buffer, or end-of-
- * file).
- */
- return read_from_buf (fstream, buffer, p - buf);
+ if (eof && !*got_boundary)
+ read_length = MIN (fstream->priv->buf->len, length);
+ else
+ read_length = p - buf;
+ return read_from_buf (fstream, buffer, read_length);
}
--
cgit v0.12
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