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authorMike DePaulo <mikedep333@gmail.com>2015-02-08 21:03:33 -0500
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-14 16:14:31 +0100
commit94c6de0649cd295044b1e4ff7265949c9c787519 (patch)
treea9a795efb5f4c84e078fd594c2535e914f5762e5 /nx-X11
parent36f1dae749acb065eaefca56d42d19ef6822a001 (diff)
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CVE-2014-0210: unvalidated length in _fs_recv_conn_setup() from xorg/lib/libXfont commit 891e084b26837162b12f841060086a105edde86d
The connection setup reply from the font server can include a list of alternate servers to contact if this font server stops working. The reply specifies a total size of all the font server names, and then provides a list of names. _fs_recv_conn_setup() allocated the specified total size for copying the names to, but didn't check to make sure it wasn't copying more data to that buffer than the size it had allocated.
Diffstat (limited to 'nx-X11')
-rw-r--r--nx-X11/lib/font/fc/fserve.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/nx-X11/lib/font/fc/fserve.c b/nx-X11/lib/font/fc/fserve.c
index bac0b8ee6..0fdcc1d84 100644
--- a/nx-X11/lib/font/fc/fserve.c
+++ b/nx-X11/lib/font/fc/fserve.c
@@ -2782,7 +2782,7 @@ _fs_recv_conn_setup (FSFpePtr conn)
int ret;
fsConnSetup *setup;
FSFpeAltPtr alts;
- int i, alt_len;
+ unsigned int i, alt_len;
int setup_len;
char *alt_save, *alt_names;
@@ -2809,9 +2809,9 @@ _fs_recv_conn_setup (FSFpePtr conn)
}
if (setup->num_alternates)
{
+ size_t alt_name_len = setup->alternate_len << 2;
alts = (FSFpeAltPtr) xalloc (setup->num_alternates *
- sizeof (FSFpeAltRec) +
- (setup->alternate_len << 2));
+ sizeof (FSFpeAltRec) + alt_name_len);
if (alts)
{
alt_names = (char *) (setup + 1);
@@ -2820,10 +2820,25 @@ _fs_recv_conn_setup (FSFpePtr conn)
{
alts[i].subset = alt_names[0];
alt_len = alt_names[1];
+ if (alt_len >= alt_name_len) {
+ /*
+ * Length is longer than setup->alternate_len
+ * told us to allocate room for, assume entire
+ * alternate list is corrupted.
+ */
+#ifdef DEBUG
+ fprintf (stderr,
+ "invalid alt list (length %lx >= %lx)\n",
+ (long) alt_len, (long) alt_name_len);
+#endif
+ free(alts);
+ return FSIO_ERROR;
+ }
alts[i].name = alt_save;
memcpy (alt_save, alt_names + 2, alt_len);
alt_save[alt_len] = '\0';
alt_save += alt_len + 1;
+ alt_name_len -= alt_len + 1;
alt_names += _fs_pad_length (alt_len + 2);
}
conn->numAlts = setup->num_alternates;