Add some error checking on the return values of chdir() and calloc(). The

first might actually happen, so it displays the error message in a prettier
way.

Found by:	Coverity Prevent(tm)
CID:		9121, 9122, 9123, 9124

usr.sbin/bsdinstall/distextract/distextract.c

@@ -46,12 +46,31 @@ main(void)
 	ndists++; /* Last one */
 
 	dists = calloc(ndists, sizeof(const char *));
+	if (dists == NULL) {
+		fprintf(stderr, "Out of memory!\n");
+		return (1);
+	}
+
 	for (i = 0; i < ndists; i++)
 		dists[i] = strsep(&diststring, " \t");
 
-	chdir(getenv("BSDINSTALL_CHROOT"));
+	init_dialog(stdin, stdout);
+	dialog_vars.backtitle = __DECONST(char *, "FreeBSD Installer");
+	dlg_put_backtitle();
+
+	if (chdir(getenv("BSDINSTALL_CHROOT")) != 0) {
+		char error[512];
+		sprintf(error, "Could could change to directory %s: %s\n",
+		    getenv("BSDINSTALL_DISTDIR"), strerror(errno));
+		dialog_msgbox("Error", error, 0, 0, TRUE);
+		end_dialog();
+		return (1);
+	}
+
 	retval = extract_files(ndists, dists);
 
+	end_dialog();
+
 	free(diststring);
 	free(dists);
 
@@ -84,9 +103,6 @@ extract_files(int nfiles, const char **files)
 		items[i*2 + 1] = "Pending";
 	}
 
-	init_dialog(stdin, stdout);
-	dialog_vars.backtitle = __DECONST(char *, "FreeBSD Installer");
-	dlg_put_backtitle();
 	dialog_msgbox("",
 	    "Checking distribution archives.\nPlease wait...", 0, 0, FALSE);
 
@@ -105,7 +121,7 @@ extract_files(int nfiles, const char **files)
 			items[i*2 + 1] = "Failed";
 			dialog_msgbox("Extract Error", errormsg, 0, 0,
 			    TRUE);
-			goto exit;
+			return (err);
 		}
 		archive_files[i] = 0;
 		while (archive_read_next_header(archive, &entry) == ARCHIVE_OK)
@@ -162,15 +178,11 @@ extract_files(int nfiles, const char **files)
 			items[i*2 + 1] = "Failed";
 			dialog_msgbox("Extract Error", errormsg, 0, 0,
 			    TRUE);
-			goto exit;
+			return (err);
 		}
 
 		archive_read_free(archive);
 	}
 
-	err = 0;
+	return (0);
-exit:
-	end_dialog();
-
-	return (err);
 }

usr.sbin/bsdinstall/distfetch/distfetch.c

@@ -46,15 +46,34 @@ main(void)
 	ndists++; /* Last one */
 
 	urls = calloc(ndists, sizeof(const char *));
+	if (urls == NULL) {
+		fprintf(stderr, "Out of memory!\n");
+		return (1);
+	}
+
+	init_dialog(stdin, stdout);
+	dialog_vars.backtitle = __DECONST(char *, "FreeBSD Installer");
+	dlg_put_backtitle();
+
 	for (i = 0; i < ndists; i++) {
 		urls[i] = malloc(PATH_MAX);
 		sprintf(urls[i], "%s/%s", getenv("BSDINSTALL_DISTSITE"),
 		    strsep(&diststring, " \t"));
 	}
 
-	chdir(getenv("BSDINSTALL_DISTDIR"));
+	if (chdir(getenv("BSDINSTALL_DISTDIR")) != 0) {
+		char error[512];
+		sprintf(error, "Could could change to directory %s: %s\n",
+		    getenv("BSDINSTALL_DISTDIR"), strerror(errno));
+		dialog_msgbox("Error", error, 0, 0, TRUE);
+		end_dialog();
+		return (1);
+	}
+
 	nfetched = fetch_files(ndists, urls);
 
+	end_dialog();
+
 	free(diststring);
 	for (i = 0; i < ndists; i++) 
 		free(urls[i]);
@@ -81,6 +100,11 @@ fetch_files(int nfiles, char **urls)
 	
 	/* Make the transfer list for dialog */
 	items = calloc(sizeof(char *), nfiles * 2);
+	if (items == NULL) {
+		fprintf(stderr, "Out of memory!\n");
+		return (-1);
+	}
+
 	for (i = 0; i < nfiles; i++) {
 		items[i*2] = strrchr(urls[i], '/');
 		if (items[i*2] != NULL)
@@ -90,10 +114,6 @@ fetch_files(int nfiles, char **urls)
 		items[i*2 + 1] = "Pending";
 	}
 
-	init_dialog(stdin, stdout);
-	dialog_vars.backtitle = __DECONST(char *, "FreeBSD Installer");
-	dlg_put_backtitle();
-
 	dialog_msgbox("", "Connecting to server.\nPlease wait...", 0, 0, FALSE);
 
 	/* Try to stat all the files */
@@ -180,8 +200,8 @@ fetch_files(int nfiles, char **urls)
 		fclose(fetch_out);
 		fclose(file_out);
 	}
-	end_dialog();
 
 	free(items);
 	return (nsuccess);
 }
+