Fix a bug where tar could change perms and ownership of dirs pointed

to by symlink within a tarball.
 -Erik

Changelog

@@ -1,6 +1,8 @@
 0.42
 	* Made tar creation support in busybox tar optional.
-	You no longer _have_ to put a "-" in front of tar options.
+	* You no longer _have_ to put a "-" in front of tar options.
+	* Tar could inadvertently change permissions and ownership on
+	    certain directories pointed to by symlinks.
 	* Made grep and grep -h do the right thing wrt printing
 	    the file name (it failed to print files names in many cases).
 	* Fix a namespace aliasing problem wereby if du was built in, the 

archival/tar.c

@@ -542,8 +542,10 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 	printf ("x %s\n", outName);
 
     if (hardLink) {
-	if (link (hp->linkName, outName) < 0)
+	if (link (hp->linkName, outName) < 0) {
 	    perror (outName);
+	    return;
+	}
 	/* Set the file time */
 	utb.actime = mtime;
 	utb.modtime = mtime;
@@ -556,8 +558,10 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 
     if (softLink) {
 #ifdef	S_ISLNK
-	if (symlink (hp->linkName, outName) < 0)
+	if (symlink (hp->linkName, outName) < 0) {
 	    perror (outName);
+	    return;
+	}
 	/* Try to change ownership of the symlink.
 	 * If libs doesn't support that, don't bother.
 	 * Changing the pointed-to file is the Wrong Thing(tm).
@@ -582,7 +586,7 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
      * If the file is a directory, then just create the path.
      */
     if (S_ISDIR (mode)) {
-	createPath (outName, mode);
+	if (createPath (outName, mode)==TRUE) { 
 	    /* Set the file time */
 	    utb.actime = mtime;
 	    utb.modtime = mtime;
@@ -592,6 +596,7 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 	    chmod(outName, mode);
 	    return;
 	}
+    }
 
     /* 
      * There is a file to write.

internal.h

@@ -156,7 +156,7 @@ int recursiveAction(const char *fileName, int recurse, int followLinks, int dept
 	  int (*dirAction) (const char *fileName, struct stat* statbuf));
 const char* timeString(time_t timeVal);
 
-extern void createPath (const char *name, int mode);
+extern int createPath (const char *name, int mode);
 extern int parse_mode( const char* s, mode_t* theMode);
 extern void usage(const char *usage) __attribute__ ((noreturn));
 

tar.c

@@ -542,8 +542,10 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 	printf ("x %s\n", outName);
 
     if (hardLink) {
-	if (link (hp->linkName, outName) < 0)
+	if (link (hp->linkName, outName) < 0) {
 	    perror (outName);
+	    return;
+	}
 	/* Set the file time */
 	utb.actime = mtime;
 	utb.modtime = mtime;
@@ -556,8 +558,10 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 
     if (softLink) {
 #ifdef	S_ISLNK
-	if (symlink (hp->linkName, outName) < 0)
+	if (symlink (hp->linkName, outName) < 0) {
 	    perror (outName);
+	    return;
+	}
 	/* Try to change ownership of the symlink.
 	 * If libs doesn't support that, don't bother.
 	 * Changing the pointed-to file is the Wrong Thing(tm).
@@ -582,7 +586,7 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
      * If the file is a directory, then just create the path.
      */
     if (S_ISDIR (mode)) {
-	createPath (outName, mode);
+	if (createPath (outName, mode)==TRUE) { 
 	    /* Set the file time */
 	    utb.actime = mtime;
 	    utb.modtime = mtime;
@@ -592,6 +596,7 @@ readHeader (const TarHeader * hp, int fileCount, char **fileTable)
 	    chmod(outName, mode);
 	    return;
 	}
+    }
 
     /* 
      * There is a file to write.

utility.c

@@ -495,11 +495,12 @@ recursiveAction(const char *fileName, int recurse, int followLinks, int depthFir
  * while all previous ones get default protections.  Errors are not reported
  * here, as failures to restore files can be reported later.
  */
-extern void createPath (const char *name, int mode)
+extern int createPath (const char *name, int mode)
 {
     char *cp;
     char *cpOld;
     char buf[NAME_MAX];
+    int retVal=0;
 
     strcpy( buf, name);
     cp = strchr (buf, '/');
@@ -507,9 +508,17 @@ extern void createPath (const char *name, int mode)
 	cpOld = cp;
 	cp = strchr (cp + 1, '/');
 	*cpOld = '\0';
-	mkdir (buf, cp ? 0777 : mode);
+	retVal = mkdir (buf, cp ? 0777 : mode);
 	*cpOld = '/';
     }
+    /* Return the result from the final directory, as that
+     * is the one that counts */
+    if( retVal!=0) {
+	if ( errno!=EEXIST) {
+	    return( FALSE);
+	}
+    }
+    return( TRUE);
 }
 #endif