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
|
--- kpdf/xpdf/XRef.cc 20 Aug 2003 21:25:12 -0000 1.3
+++ kpdf/xpdf/XRef.cc 18 Oct 2004 20:12:09 -0000
@@ -74,10 +74,16 @@ XRef::XRef(BaseStream *strA, GString *ow
return;
}
// trailer is ok - read the xref table
} else {
+ if (size*sizeof(XRefEntry)/sizeof(XRefEntry) != size) {
+ error(-1, "Invalid 'size' inside xref table.");
+ ok = gFalse;
+ errCode = errDamaged;
+ return;
+ }
entries = (XRefEntry *)gmalloc(size * sizeof(XRefEntry));
for (i = 0; i < size; ++i) {
entries[i].offset = 0xffffffff;
entries[i].used = gFalse;
}
@@ -265,10 +271,14 @@ GBool XRef::readXRef(Guint *pos) {
}
// check for buggy PDF files with an incorrect (too small) xref
// table size
if (first + n > size) {
newSize = size + 256;
+ if (newSize*sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) {
+ error(-1, "Invalid 'newSize'");
+ goto err2;
+ }
entries = (XRefEntry *)grealloc(entries, newSize * sizeof(XRefEntry));
for (i = size; i < newSize; ++i) {
entries[i].offset = 0xffffffff;
entries[i].used = gFalse;
}
@@ -413,10 +423,14 @@ GBool XRef::constructXRef() {
++p;
} while (*p && isspace(*p));
if (!strncmp(p, "obj", 3)) {
if (num >= size) {
newSize = (num + 1 + 255) & ~255;
+ if (newSize*sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) {
+ error(-1, "Invalid 'obj' parameters.");
+ return gFalse;
+ }
entries = (XRefEntry *)
grealloc(entries, newSize * sizeof(XRefEntry));
for (i = size; i < newSize; ++i) {
entries[i].offset = 0xffffffff;
entries[i].used = gFalse;
@@ -434,10 +448,15 @@ GBool XRef::constructXRef() {
}
} else if (!strncmp(p, "endstream", 9)) {
if (streamEndsLen == streamEndsSize) {
streamEndsSize += 64;
+ if (streamEndsSize*sizeof(int)/sizeof(int) != streamEndsSize) {
+ error(-1, "Invalid 'endstream' parameter.");
+ return gFalse;
+ }
+
streamEnds = (Guint *)grealloc(streamEnds,
streamEndsSize * sizeof(int));
}
streamEnds[streamEndsLen++] = pos;
}
|
