libio: Use stdin consistently for input functions [BZ #24153]

The internal _IO_stdin_ variable is not updated when the application
assigns to stdin, which is a GNU extension.

1 files changed, 5 insertions, 5 deletions

diff --git a/libio/getchar.c b/libio/getchar.c
index 7e385305ff..90dea38ddb 100644
--- a/libio/getchar.c
+++ b/libio/getchar.c
@@ -33,11 +33,11 @@ int
 getchar (void)
 {
   int result;
-  if (!_IO_need_lock (_IO_stdin))
-    return _IO_getc_unlocked (_IO_stdin);
-  _IO_acquire_lock (_IO_stdin);
-  result = _IO_getc_unlocked (_IO_stdin);
-  _IO_release_lock (_IO_stdin);
+  if (!_IO_need_lock (stdin))
+    return _IO_getc_unlocked (stdin);
+  _IO_acquire_lock (stdin);
+  result = _IO_getc_unlocked (stdin);
+  _IO_release_lock (stdin);
   return result;
 }