[PATCH] kconf: Check for eof from input stream.

Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 16 insertions, 2 deletions

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 8ba5d29d3d..10eeae53d8 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -63,6 +63,20 @@ static void check_stdin(void)
         }
 }
 
+static char *fgets_check_stream(char *s, int size, FILE *stream)
+{
+        char *ret = fgets(s, size, stream);
+
+        if (ret == NULL && feof(stream)) {
+                printf(_("aborted!\n\n"));
+                printf(_("Console input is closed. "));
+                printf(_("Run 'make oldconfig' to update configuration.\n\n"));
+                exit(1);
+        }
+
+        return ret;
+}
+
 static void conf_askvalue(struct symbol *sym, const char *def)
 {
         enum symbol_type type = sym_get_type(sym);
@@ -100,7 +114,7 @@ static void conf_askvalue(struct symbol *sym, const char *def)
                 check_stdin();
         case ask_all:
                 fflush(stdout);
-                fgets(line, 128, stdin);
+                fgets_check_stream(line, 128, stdin);
                 return;
         case set_default:
                 printf("%s\n", def);
@@ -356,7 +370,7 @@ static int conf_choice(struct menu *menu)
                         check_stdin();
                 case ask_all:
                         fflush(stdout);
-                        fgets(line, 128, stdin);
+                        fgets_check_stream(line, 128, stdin);
                         strip(line);
                         if (line[0] == '?') {
                                 printf("\n%s\n", menu->sym->help ?