1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
From e3c51160c87bc8cfe43f944df641bc1e627797ec Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Fri, 3 May 2013 23:29:22 -0700
Subject: [PATCH] Use _XEatDataWords to avoid overflow of rep.length bit shifting
rep.length is a CARD32, so rep.length << 2 could overflow in 32-bit builds
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Julien Cristau <jcristau@debian.org>
---
configure.ac | 6 ++++++
src/Xrandrint.h | 13 +++++++++++++
src/XrrCrtc.c | 6 +++---
src/XrrOutput.c | 2 +-
src/XrrProperty.c | 9 ++++-----
src/XrrScreen.c | 2 +-
6 files changed, 28 insertions(+), 10 deletions(-)
diff --git a/configure.ac b/configure.ac
index 8c74adb..46401ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,6 +56,12 @@ AC_SUBST(RANDR_VERSION)
# Obtain compiler/linker options for depedencies
PKG_CHECK_MODULES(RANDR, x11 randrproto >= $RANDR_VERSION xext xextproto xrender renderproto)
+# Check for _XEatDataWords function that may be patched into older Xlib release
+SAVE_LIBS="$LIBS"
+LIBS="$RANDR_LIBS"
+AC_CHECK_FUNCS([_XEatDataWords])
+LIBS="$SAVE_LIBS"
+
AC_CONFIG_FILES([Makefile
src/Makefile
man/Makefile
diff --git a/src/Xrandrint.h b/src/Xrandrint.h
index 7fb5831..791b36b 100644
--- a/src/Xrandrint.h
+++ b/src/Xrandrint.h
@@ -42,6 +42,19 @@ extern char XRRExtensionName[];
XExtDisplayInfo *XRRFindDisplay (Display *dpy);
+#ifndef HAVE__XEATDATAWORDS
+#include <X11/Xmd.h> /* for LONG64 on 64-bit platforms */
+#include <limits.h>
+
+static inline void _XEatDataWords(Display *dpy, unsigned long n)
+{
+# ifndef LONG64
+ if (n >= (ULONG_MAX >> 2))
+ _XIOError(dpy);
+# endif
+ _XEatData (dpy, n << 2);
+}
+#endif
/* deliberately opaque internal data structure; can be extended,
but not reordered */
diff --git a/src/XrrCrtc.c b/src/XrrCrtc.c
index 697987a..d3c748b 100644
--- a/src/XrrCrtc.c
+++ b/src/XrrCrtc.c
@@ -74,7 +74,7 @@ XRRGetCrtcInfo (Display *dpy, XRRScreenResources *resources, RRCrtc crtc)
xci = (XRRCrtcInfo *) Xmalloc(rbytes);
if (xci == NULL) {
- _XEatData (dpy, (unsigned long) nbytes);
+ _XEatDataWords (dpy, rep.length);
UnlockDisplay (dpy);
SyncHandle ();
return NULL;
@@ -203,7 +203,7 @@ XRRGetCrtcGamma (Display *dpy, RRCrtc crtc)
if (!crtc_gamma)
{
- _XEatData (dpy, (unsigned long) nbytes);
+ _XEatDataWords (dpy, rep.length);
goto out;
}
_XRead16 (dpy, crtc_gamma->red, rep.size * 2);
@@ -397,7 +397,7 @@ XRRGetCrtcTransform (Display *dpy,
int extraBytes = rep.length * 4 - CrtcTransformExtra;
extra = Xmalloc (extraBytes);
if (!extra) {
- _XEatData (dpy, extraBytes);
+ _XEatDataWords (dpy, rep.length - (CrtcTransformExtra >> 2));
UnlockDisplay (dpy);
SyncHandle ();
return False;
diff --git a/src/XrrOutput.c b/src/XrrOutput.c
index 18863bd..487d38a 100644
--- a/src/XrrOutput.c
+++ b/src/XrrOutput.c
@@ -81,7 +81,7 @@ XRRGetOutputInfo (Display *dpy, XRRScreenResources *resources, RROutput output)
xoi = (XRROutputInfo *) Xmalloc(rbytes);
if (xoi == NULL) {
- _XEatData (dpy, (unsigned long) nbytes);
+ _XEatDataWords (dpy, rep.length - (OutputInfoExtra >> 2));
UnlockDisplay (dpy);
SyncHandle ();
return NULL;
diff --git a/src/XrrProperty.c b/src/XrrProperty.c
index 1a125b2..afa9d24 100644
--- a/src/XrrProperty.c
+++ b/src/XrrProperty.c
@@ -62,7 +62,7 @@ XRRListOutputProperties (Display *dpy, RROutput output, int *nprop)
props = (Atom *) Xmalloc (rbytes);
if (props == NULL) {
- _XEatData (dpy, nbytes);
+ _XEatDataWords (dpy, rep.length);
UnlockDisplay (dpy);
SyncHandle ();
*nprop = 0;
@@ -107,7 +107,7 @@ XRRQueryOutputProperty (Display *dpy, RROutput output, Atom property)
prop_info = (XRRPropertyInfo *) Xmalloc (rbytes);
if (prop_info == NULL) {
- _XEatData (dpy, nbytes);
+ _XEatDataWords(dpy, rep.length);
UnlockDisplay (dpy);
SyncHandle ();
return NULL;
@@ -313,14 +313,13 @@ XRRGetOutputProperty (Display *dpy, RROutput output,
* This part of the code should never be reached. If it is,
* the server sent back a property with an invalid format.
*/
- nbytes = rep.length << 2;
- _XEatData(dpy, (unsigned long) nbytes);
+ _XEatDataWords(dpy, rep.length);
UnlockDisplay(dpy);
SyncHandle();
return(BadImplementation);
}
if (! *prop) {
- _XEatData(dpy, (unsigned long) nbytes);
+ _XEatDataWords(dpy, rep.length);
UnlockDisplay(dpy);
SyncHandle();
return(BadAlloc);
diff --git a/src/XrrScreen.c b/src/XrrScreen.c
index 54bc2ca..c4e9eb5 100644
--- a/src/XrrScreen.c
+++ b/src/XrrScreen.c
@@ -129,7 +129,7 @@ doGetScreenResources (Display *dpy, Window window, int poll)
if (xrsr == NULL || wire_names == NULL) {
if (xrsr) Xfree (xrsr);
if (wire_names) Xfree (wire_names);
- _XEatData (dpy, (unsigned long) nbytes);
+ _XEatDataWords (dpy, rep.length);
UnlockDisplay (dpy);
SyncHandle ();
return NULL;
--
1.7.2.5
|
