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-rw-r--r--src/parse.c101
1 files changed, 76 insertions, 25 deletions
diff --git a/src/parse.c b/src/parse.c
index 3c819a2..39fe9b4 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -1,3 +1,4 @@
+/* $XdotOrg: xc/extras/Xpm/lib/parse.c,v 1.2.4.2 2004/12/17 01:09:36 gisburn Exp $ */
/*
* Copyright (C) 1989-95 GROUPE BULL
*
@@ -40,10 +41,30 @@
* HeDu (hedu@cul-ipn.uni-kiel.de) 4/94
*/
+/* October 2004, source code review by Thomas Biege <thomas@suse.de> */
+
#include "XpmI.h"
#include <ctype.h>
#include <string.h>
+#ifdef HAS_STRLCAT
+# define STRLCAT(dst, src, dstsize) do { \
+ if (strlcat(dst, src, dstsize) >= (dstsize)) \
+ return (XpmFileInvalid); } while(0)
+# define STRLCPY(dst, src, dstsize) do { \
+ if (strlcpy(dst, src, dstsize) >= (dstsize)) \
+ return (XpmFileInvalid); } while(0)
+#else
+# define STRLCAT(dst, src, dstsize) do { \
+ if ((strlen(dst) + strlen(src)) < (dstsize)) \
+ strcat(dst, src); \
+ else return (XpmFileInvalid); } while(0)
+# define STRLCPY(dst, src, dstsize) do { \
+ if (strlen(src) < (dstsize)) \
+ strcpy(dst, src); \
+ else return (XpmFileInvalid); } while(0)
+#endif
+
LFUNC(ParsePixels, int, (xpmData *data, unsigned int width,
unsigned int height, unsigned int ncolors,
unsigned int cpp, XpmColor *colorTable,
@@ -66,7 +87,7 @@ xpmParseValues(data, width, height, ncolors, cpp,
unsigned int *extensions;
{
unsigned int l;
- char buf[BUFSIZ];
+ char buf[BUFSIZ + 1];
if (!data->format) { /* XPM 2 or 3 */
@@ -175,10 +196,10 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
XpmColor **colorTablePtr;
xpmHashTable *hashtable;
{
- unsigned int key = 0, l, a, b;
+ unsigned int key = 0, l, a, b, len;
unsigned int curkey; /* current color key */
unsigned int lastwaskey; /* key read */
- char buf[BUFSIZ];
+ char buf[BUFSIZ+1];
char curbuf[BUFSIZ]; /* current buffer */
char **sptr, *s;
XpmColor *color;
@@ -186,6 +207,8 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
char **defaults;
int ErrorStatus;
+ if (ncolors >= UINT_MAX / sizeof(XpmColor))
+ return (XpmNoMemory);
colorTable = (XpmColor *) XpmCalloc(ncolors, sizeof(XpmColor));
if (!colorTable)
return (XpmNoMemory);
@@ -197,6 +220,10 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
/*
* read pixel value
*/
+ if (cpp >= UINT_MAX - 1) {
+ xpmFreeColorTable(colorTable, ncolors);
+ return (XpmNoMemory);
+ }
color->string = (char *) XpmMalloc(cpp + 1);
if (!color->string) {
xpmFreeColorTable(colorTable, ncolors);
@@ -234,13 +261,14 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
}
if (!lastwaskey && key < NKEYS) { /* open new key */
if (curkey) { /* flush string */
- s = (char *) XpmMalloc(strlen(curbuf) + 1);
+ len = strlen(curbuf) + 1;
+ s = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
defaults[curkey] = s;
- strcpy(s, curbuf);
+ memcpy(s, curbuf, len);
}
curkey = key + 1; /* set new key */
*curbuf = '\0'; /* reset curbuf */
@@ -251,9 +279,9 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
return (XpmFileInvalid);
}
if (!lastwaskey)
- strcat(curbuf, " "); /* append space */
+ STRLCAT(curbuf, " ", sizeof(curbuf));/* append space */
buf[l] = '\0';
- strcat(curbuf, buf);/* append buf */
+ STRLCAT(curbuf, buf, sizeof(curbuf)); /* append buf */
lastwaskey = 0;
}
}
@@ -261,12 +289,13 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
xpmFreeColorTable(colorTable, ncolors);
return (XpmFileInvalid);
}
- s = defaults[curkey] = (char *) XpmMalloc(strlen(curbuf) + 1);
+ len = strlen(curbuf) + 1; /* integer overflow just theoretically possible */
+ s = defaults[curkey] = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
- strcpy(s, curbuf);
+ memcpy(s, curbuf, len);
}
} else { /* XPM 1 */
/* get to the beginning of the first string */
@@ -279,6 +308,10 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
/*
* read pixel value
*/
+ if (cpp >= UINT_MAX - 1) {
+ xpmFreeColorTable(colorTable, ncolors);
+ return (XpmNoMemory);
+ }
color->string = (char *) XpmMalloc(cpp + 1);
if (!color->string) {
xpmFreeColorTable(colorTable, ncolors);
@@ -307,19 +340,20 @@ xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
*curbuf = '\0'; /* init curbuf */
while ((l = xpmNextWord(data, buf, BUFSIZ))) {
if (*curbuf != '\0')
- strcat(curbuf, " ");/* append space */
+ STRLCAT(curbuf, " ", sizeof(curbuf));/* append space */
buf[l] = '\0';
- strcat(curbuf, buf); /* append buf */
+ STRLCAT(curbuf, buf, sizeof(curbuf)); /* append buf */
}
- s = (char *) XpmMalloc(strlen(curbuf) + 1);
+ len = strlen(curbuf) + 1;
+ s = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
- strcpy(s, curbuf);
+ memcpy(s, curbuf, len);
color->c_color = s;
*curbuf = '\0'; /* reset curbuf */
- if (a < ncolors - 1)
+ if (a < ncolors - 1) /* can we trust ncolors -> leave data's bounds */
xpmNextString(data); /* get to the next string */
}
}
@@ -338,9 +372,12 @@ ParsePixels(data, width, height, ncolors, cpp, colorTable, hashtable, pixels)
xpmHashTable *hashtable;
unsigned int **pixels;
{
- unsigned int *iptr, *iptr2;
+ unsigned int *iptr, *iptr2 = NULL; /* found by Egbert Eich */
unsigned int a, x, y;
+ if ((height > 0 && width >= UINT_MAX / height) ||
+ width * height >= UINT_MAX / sizeof(unsigned int))
+ return XpmNoMemory;
#ifndef FOR_MSW
iptr2 = (unsigned int *) XpmMalloc(sizeof(unsigned int) * width * height);
#else
@@ -364,6 +401,11 @@ ParsePixels(data, width, height, ncolors, cpp, colorTable, hashtable, pixels)
{
unsigned short colidx[256];
+ if (ncolors > 256) {
+ XpmFree(iptr2); /* found by Egbert Eich */
+ return (XpmFileInvalid);
+ }
+
bzero((char *)colidx, 256 * sizeof(short));
for (a = 0; a < ncolors; a++)
colidx[(unsigned char)colorTable[a].string[0]] = a + 1;
@@ -389,16 +431,20 @@ ParsePixels(data, width, height, ncolors, cpp, colorTable, hashtable, pixels)
{
/* free all allocated pointers at all exits */
-#define FREE_CIDX {int f; for (f = 0; f < 256; f++) \
-if (cidx[f]) XpmFree(cidx[f]);}
+#define FREE_CIDX \
+do \
+{ \
+ int f; for (f = 0; f < 256; f++) \
+ if (cidx[f]) XpmFree(cidx[f]); \
+} while(0)
/* array of pointers malloced by need */
unsigned short *cidx[256];
- int char1;
+ unsigned int char1;
bzero((char *)cidx, 256 * sizeof(unsigned short *)); /* init */
for (a = 0; a < ncolors; a++) {
- char1 = colorTable[a].string[0];
+ char1 = (unsigned char) colorTable[a].string[0];
if (cidx[char1] == NULL) { /* get new memory */
cidx[char1] = (unsigned short *)
XpmCalloc(256, sizeof(unsigned short));
@@ -442,6 +488,11 @@ if (cidx[f]) XpmFree(cidx[f]);}
char *s;
char buf[BUFSIZ];
+ if (cpp >= sizeof(buf)) {
+ XpmFree(iptr2); /* found by Egbert Eich */
+ return (XpmFileInvalid);
+ }
+
buf[cpp] = '\0';
if (USE_HASHTABLE) {
xpmHashAtom *slot;
@@ -450,7 +501,7 @@ if (cidx[f]) XpmFree(cidx[f]);}
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
for (a = 0, s = buf; a < cpp; a++, s++)
- *s = xpmGetC(data);
+ *s = xpmGetC(data); /* int assigned to char, not a problem here */
slot = xpmHashSlot(hashtable, buf);
if (!*slot) { /* no color matches */
XpmFree(iptr2);
@@ -464,7 +515,7 @@ if (cidx[f]) XpmFree(cidx[f]);}
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
for (a = 0, s = buf; a < cpp; a++, s++)
- *s = xpmGetC(data);
+ *s = xpmGetC(data); /* int assigned to char, not a problem here */
for (a = 0; a < ncolors; a++)
if (!strcmp(colorTable[a].string, buf))
break;
@@ -519,7 +570,7 @@ xpmParseExtensions(data, extensions, nextensions)
while (!notstart && notend) {
/* there starts an extension */
ext = (XpmExtension *)
- XpmRealloc(exts, (num + 1) * sizeof(XpmExtension));
+ XpmRealloc(exts, (num + 1) * sizeof(XpmExtension)); /* can the loop be forced to iterate often enough to make "(num + 1) * sizeof(XpmExtension)" wrapping? */
if (!ext) {
XpmFree(string);
XpmFreeExtensions(exts, num);
@@ -556,7 +607,7 @@ xpmParseExtensions(data, extensions, nextensions)
while ((notstart = strncmp("XPMEXT", string, 6))
&& (notend = strncmp("XPMENDEXT", string, 9))) {
sp = (char **)
- XpmRealloc(ext->lines, (nlines + 1) * sizeof(char *));
+ XpmRealloc(ext->lines, (nlines + 1) * sizeof(char *)); /* can we iterate enough for a wrapping? */
if (!sp) {
XpmFree(string);
ext->nlines = nlines;
@@ -596,9 +647,9 @@ xpmParseExtensions(data, extensions, nextensions)
/* function call in case of error */
#undef RETURN
#define RETURN(status) \
-{ \
+do { \
goto error; \
-}
+} while(0)
/*
* This function parses an Xpm file or data and store the found informations
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-28 17:01:20 +0000