commit a500b48bd2a6401de442c00f433079d24331dbb6
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Tue Aug 13 21:08:49 2024 -0400

    ungetc: Fix backup buffer leak on program exit [BZ #27821]
    
    If a file descriptor is left unclosed and is cleaned up by _IO_cleanup
    on exit, its backup buffer remains unfreed, registering as a leak in
    valgrind.  This is not strictly an issue since (1) the program should
    ideally be closing the stream once it's not in use and (2) the program
    is about to exit anyway, so keeping the backup buffer around a wee bit
    longer isn't a real problem.  Free it anyway to keep valgrind happy
    when the streams in question are the standard ones, i.e. stdout, stdin
    or stderr.
    
    Also, the _IO_have_backup macro checks for _IO_save_base,
    which is a roundabout way to check for a backup buffer instead of
    directly looking for _IO_backup_base.  The roundabout check breaks when
    the main get area has not been used and user pushes a char into the
    backup buffer with ungetc.  Fix this to use the _IO_backup_base
    directly.
    
    Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    (cherry picked from commit 3e1d8d1d1dca24ae90df2ea826a8916896fc7e77)

diff --git a/libio/genops.c b/libio/genops.c
index 4f5c6136f3ef1b88..bb1d9594ebb60375 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -789,6 +789,12 @@ _IO_unbuffer_all (void)
 	legacy = 1;
 #endif
 
+      /* Free up the backup area if it was ever allocated.  */
+      if (_IO_have_backup (fp))
+	_IO_free_backup_area (fp);
+      if (fp->_mode > 0 && _IO_have_wbackup (fp))
+	_IO_free_wbackup_area (fp);
+
       if (! (fp->_flags & _IO_UNBUFFERED)
 	  /* Iff stream is un-orientated, it wasn't used. */
 	  && (legacy || fp->_mode != 0))
diff --git a/libio/libioP.h b/libio/libioP.h
index 1af287b19f30fa2a..616253fcd00f04db 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -577,8 +577,8 @@ extern void _IO_old_init (FILE *fp, int flags) __THROW;
        ((__fp)->_wide_data->_IO_write_base \
 	= (__fp)->_wide_data->_IO_write_ptr = __p, \
 	(__fp)->_wide_data->_IO_write_end = (__ep))
-#define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
-#define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_save_base != NULL)
+#define _IO_have_backup(fp) ((fp)->_IO_backup_base != NULL)
+#define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_backup_base != NULL)
 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 159dc472e4c76b9a..b9c38ce6b3b2f43a 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -257,6 +257,7 @@ tests := \
   tst-swscanf \
   tst-tmpnam \
   tst-ungetc \
+  tst-ungetc-leak \
   tst-unlockedio \
   tst-vfprintf-mbs-prec \
   tst-vfprintf-user-type \
@@ -301,6 +302,7 @@ tests-special += \
   $(objpfx)tst-printfsz-islongdouble.out \
   $(objpfx)tst-setvbuf1-cmp.out \
   $(objpfx)tst-unbputc.out \
+  $(objpfx)tst-ungetc-leak-mem.out \
   $(objpfx)tst-vfprintf-width-prec-mem.out \
   # tests-special
 
@@ -315,6 +317,8 @@ generated += \
   tst-printf-fp-leak-mem.out \
   tst-printf-fp-leak.mtrace \
   tst-scanf-bz27650.mtrace \
+  tst-ungetc-leak-mem.out \
+  tst-ungetc-leak.mtrace \
   tst-vfprintf-width-prec-mem.out \
   tst-vfprintf-width-prec.mtrace \
   # generated
@@ -407,6 +411,9 @@ tst-printf-fp-leak-ENV = \
 tst-scanf-bz27650-ENV = \
   MALLOC_TRACE=$(objpfx)tst-scanf-bz27650.mtrace \
   LD_PRELOAD=$(common-objpfx)malloc/libc_malloc_debug.so
+tst-ungetc-leak-ENV = \
+  MALLOC_TRACE=$(objpfx)tst-ungetc-leak.mtrace \
+  LD_PRELOAD=$(common-objpfx)malloc/libc_malloc_debug.so
 
 $(objpfx)tst-unbputc.out: tst-unbputc.sh $(objpfx)tst-unbputc
 	$(SHELL) $< $(common-objpfx) '$(test-program-prefix)'; \
diff --git a/stdio-common/tst-ungetc-leak.c b/stdio-common/tst-ungetc-leak.c
new file mode 100644
index 0000000000000000..6c5152b43f80b217
--- /dev/null
+++ b/stdio-common/tst-ungetc-leak.c
@@ -0,0 +1,32 @@
+/* Test for memory leak with ungetc when stream is unused.
+   Copyright The GNU Toolchain Authors.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <mcheck.h>
+#include <support/check.h>
+#include <support/support.h>
+
+static int
+do_test (void)
+{
+  mtrace ();
+  TEST_COMPARE (ungetc('y', stdin), 'y');
+  return 0;
+}
+
+#include <support/test-driver.c>