From 66e576f88da1738d44b11b96bc027d4761944277 Mon Sep 17 00:00:00 2001
From: "Jordan K. Hubbard" <jkh@FreeBSD.org>
Date: Wed, 5 May 1999 10:14:06 +0000
Subject: Fix a few bogons and make this safer for humanity.

---
 release/sysinstall/kget.c | 59 +++++++++++++++++++++++++++++------------------
 1 file changed, 36 insertions(+), 23 deletions(-)

(limited to 'release')

diff --git a/release/sysinstall/kget.c b/release/sysinstall/kget.c
index b3cc55e38254..2520480e05c8 100644
--- a/release/sysinstall/kget.c
+++ b/release/sysinstall/kget.c
@@ -23,20 +23,20 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: kget.c,v 1.3 1999/02/16 01:58:04 jkh Exp $
+ * $Id: kget.c,v 1.4 1999/03/10 02:50:31 jkh Exp $
  */
 
 #include "sysinstall.h"
 #include <sys/sysctl.h>
-#include "i386/isa/isa_device.h"
-#include "i386/isa/pnp.h"
+#include <isa/isa_device.h>
+#include <isa/pnp.h>
 
 int
 kget(char *out)
 {
-    int len, i, bytes_written = 0;
+    int len, i, bytes_written;
     char *buf;
-    char *mib = "machdep.uc_devlist";
+    char *mib1 = "machdep.uc_devlist";
     char *mib2 = "machdep.uc_pnplist";
     char name[9];
     FILE *fout;
@@ -44,33 +44,41 @@ kget(char *out)
     struct pnp_cinfo *c;
     char *p;
  
-    fout = fopen(out, "w");
-    if (fout == NULL) {
-	msgDebug("kget: Unable to open %s for writing.\n", out);
-	return -1;
-    }
-
     /* We use sysctlbyname, because the oid is unknown (OID_AUTO) */
     /* get the buffer size */
-    i = sysctlbyname(mib, NULL, &len, NULL, NULL);
+    i = sysctlbyname(mib1, NULL, &len, NULL, NULL);
     if (i) {
 	msgDebug("kget: error buffer sizing\n");
 	return -1;
     }
-    buf = (char *)malloc(len * sizeof(char));
-    i = sysctlbyname(mib, buf, &len, NULL, NULL);
+    if (len <= 0) {
+	msgDebug("kget: mib1 has length of %d\n", len);
+	return -1;
+    }
+    buf = (char *)alloca(len * sizeof(char));
+    i = sysctlbyname(mib1, buf, &len, NULL, NULL);
     if (i) {
 	msgDebug("kget: error retrieving data\n");
 	return -1;
     }
-    i = 0;
+
+    /* now it's time to create the output file; if we end up not writing to
+       it, we'll unlink() it later. */
+    fout = fopen(out, "w");
+    if (fout == NULL) {
+	msgDebug("kget: Unable to open %s for writing.\n", out);
+	return -1;
+    }
+
+    i = bytes_written = 0;
     while (i < len) {
 	id = (struct isa_device *)(buf + i);
 	p = (buf + i + sizeof(struct isa_device));
 	strncpy(name, p, 8);
 	if (!id->id_enabled) {
 	    bytes_written += fprintf(fout, "di %s%d\n", name, id->id_unit);
-	} else {
+	}
+	else {
 	    bytes_written += fprintf(fout, "en %s%d\n", name, id->id_unit);
 	    if (id->id_iobase > 0) {
 		bytes_written += fprintf(fout, "po %s%d %#x\n",
@@ -97,7 +105,6 @@ kget(char *out)
 	}
 	i += sizeof(struct isa_device) + 8;
     }
-    free(buf), buf = NULL;
     /* Now, print the changes to PnP override table */
     i = sysctlbyname(mib2, NULL, &len, NULL, NULL);
     if (i) {
@@ -105,14 +112,19 @@ kget(char *out)
 	msgDebug("kget: can't get PnP data - skipping...\n");
 	goto bail;
     }
-    buf = (char *)malloc(len * sizeof(char));
+    if (len <= 0) {
+	msgDebug("kget: PnP data has length of %d\n", len);
+	goto bail;
+    }
+    buf = (char *)alloca(len * sizeof(char));
     i = sysctlbyname(mib2, buf, &len, NULL, NULL);
     if (i) {
-	msgDebug("kget: error retrieving data\n");
+	msgDebug("kget: error retrieving data mib2\n");
 	goto bail;
     }
-    i = 0;
     /* Print the PnP override table. Taken from userconfig.c */
+ 
+    i = 0;
     do {
 	c = (struct pnp_cinfo *)(buf + i);
 	if (c->csn >0 && c->csn != 255) {
@@ -143,9 +155,10 @@ kget(char *out)
         }
     } while ((i += sizeof(struct pnp_cinfo)) < len);
 bail:
-    fprintf(fout, "q\n");
+    if (bytes_written)
+	fprintf(fout, "q\n");
+    else
+	unlink(out);
     fclose(fout);
-    if (buf)
-       free(buf);
     return 0;
 }
-- 
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