source: patches/gawk-3.1.5-segfault_fix-1.patch@ 7a42ca4

Submitted By: Matthew Burgess <matthew@linuxfromscratch.org>
Date: 2005-09-24
Initial Package Version: 3.1.5
Upstream Status: From Upstream
Origin: http://lists.gnu.org/archive/html/bug-gnu-utils/2005-08/msg00047.html
Description: Fixes a bug which causes gawk to segfault when operating on a non-existent file.

diff -Naur gawk-3.1.5.orig/io.c gawk-3.1.5/io.c
--- gawk-3.1.5.orig/io.c        2005-07-26 18:07:43.000000000 +0000
+++ gawk-3.1.5/io.c     2005-09-24 14:43:13.771380264 +0000
@@ -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");