Joined with branch XORG-6_8_2.lg3d-rel-0-6-2lg3d-masterlg3d-dev-0-7-1lg3d-dev-0-7-0lg3d-dev-0-6-2lg3d-dev-0-6-1-1

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