blob: 366bd4f32b54ce8d632d9f09712fd5fe5464f6ec (
plain)
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
|
# HG changeset patch
# User Eric Rahm <erahm@mozilla.com>
# Date 1428706223 25200
# Node ID 438d9e2a991ab82381a1a1442a470b2565c80c13
# Parent 1c0861d7a6457f461cccccb2e0895a9f9d34c8d4
Bug 1140537 - Sanity check size calculations. r=peterv
diff --git a/parser/expat/lib/xmlparse.c b/parser/expat/lib/xmlparse.c
--- a/parser/expat/lib/xmlparse.c
+++ b/parser/expat/lib/xmlparse.c
@@ -1648,29 +1648,40 @@ XML_ParseBuffer(XML_Parser parser, int l
XmlUpdatePosition(encoding, positionPtr, bufferPtr, &position);
positionPtr = bufferPtr;
return result;
}
void * XMLCALL
XML_GetBuffer(XML_Parser parser, int len)
{
+/* BEGIN MOZILLA CHANGE (sanity check len) */
+ if (len < 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
switch (ps_parsing) {
case XML_SUSPENDED:
errorCode = XML_ERROR_SUSPENDED;
return NULL;
case XML_FINISHED:
errorCode = XML_ERROR_FINISHED;
return NULL;
default: ;
}
if (len > bufferLim - bufferEnd) {
- /* FIXME avoid integer overflow */
int neededSize = len + (int)(bufferEnd - bufferPtr);
+/* BEGIN MOZILLA CHANGE (sanity check neededSize) */
+ if (neededSize < 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
#ifdef XML_CONTEXT_BYTES
int keep = (int)(bufferPtr - buffer);
if (keep > XML_CONTEXT_BYTES)
keep = XML_CONTEXT_BYTES;
neededSize += keep;
#endif /* defined XML_CONTEXT_BYTES */
if (neededSize <= bufferLim - buffer) {
@@ -1689,17 +1700,25 @@ XML_GetBuffer(XML_Parser parser, int len
}
else {
char *newBuf;
int bufferSize = (int)(bufferLim - bufferPtr);
if (bufferSize == 0)
bufferSize = INIT_BUFFER_SIZE;
do {
bufferSize *= 2;
- } while (bufferSize < neededSize);
+/* BEGIN MOZILLA CHANGE (prevent infinite loop on overflow) */
+ } while (bufferSize < neededSize && bufferSize > 0);
+/* END MOZILLA CHANGE */
+/* BEGIN MOZILLA CHANGE (sanity check bufferSize) */
+ if (bufferSize <= 0) {
+ errorCode = XML_ERROR_NO_MEMORY;
+ return NULL;
+ }
+/* END MOZILLA CHANGE */
newBuf = (char *)MALLOC(bufferSize);
if (newBuf == 0) {
errorCode = XML_ERROR_NO_MEMORY;
return NULL;
}
bufferLim = newBuf + bufferSize;
#ifdef XML_CONTEXT_BYTES
if (bufferPtr) {
|
