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http://lists.gnu.org/archive/html/bug-gnu-utils/2005-08/msg00047.html

--- ./io.c  2005-07-26 21:07:43.000000000 +0300
+++ ./io.c  2005-08-12 13:10:28.239852344 +0300
@@ -2480,9 +2480,12 @@
 {
 	struct stat sbuf;
 	struct open_hook *oh;
+	int iop_malloced = FALSE;
 
-	if (iop == NULL)
+	if (iop == NULL) {
 		emalloc(iop, IOBUF *, sizeof(IOBUF), "iop_alloc");
+		iop_malloced = TRUE;
+	}
 	memset(iop, '\0', sizeof(IOBUF));
 	iop->flag = 0;
 	iop->fd = fd;
@@ -2495,7 +2498,8 @@
 	}
 
 	if (iop->fd == INVALID_HANDLE) {
-		free(iop);
+		if (iop_malloced)
+			free(iop);
 		return NULL;
 	}
 	if (isatty(iop->fd))
@@ -2503,7 +2507,7 @@
 	iop->readsize = iop->size = optimal_bufsize(iop->fd, & sbuf);
 	iop->sbuf = sbuf;
 	if (do_lint && S_ISREG(sbuf.st_mode) && sbuf.st_size == 0)
-			lintwarn(_("data file `%s' is empty"), name);
+		lintwarn(_("data file `%s' is empty"), name);
 	errno = 0;
 	iop->count = iop->scanoff = 0;
 	emalloc(iop->buf, char *, iop->size += 2, "iop_alloc");