[BZ #22830] malloc_stats: restore cancellation for stderr correctly.

malloc_stats means to disable cancellation for writes to stderr while
it runs, but it restores stderr->_flags2 with |= instead of =, so what
it actually does is disable cancellation on stderr permanently.

	[BZ #22830]
	* malloc/malloc.c (__malloc_stats): Restore stderr->_flags2
        correctly.
        * malloc/tst-malloc-stats-cancellation.c: New test case.
        * malloc/Makefile: Add new test case.

1 files changed, 1 insertions, 1 deletions

diff --git a/malloc/malloc.c b/malloc/malloc.c
index f8e7250f70..3224b3a899 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -5009,7 +5009,7 @@ __malloc_stats (void)
   fprintf (stderr, "max mmap regions = %10u\n", (unsigned int) mp_.max_n_mmaps);
   fprintf (stderr, "max mmap bytes   = %10lu\n",
            (unsigned long) mp_.max_mmapped_mem);
-  ((_IO_FILE *) stderr)->_flags2 |= old_flags2;
+  ((_IO_FILE *) stderr)->_flags2 = old_flags2;
   _IO_funlockfile (stderr);
 }