From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue, 14 Apr 2020 20:41:56 +0000 (-0300)
Subject: linux: Use internal DIR locks when accessing filepos on telldir
X-Git-Tag: glibc-2.32~292
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef3330fde49502c342cf0541cd3c283a3c4a79cd;p=thirdparty%2Fglibc.git

linux: Use internal DIR locks when accessing filepos on telldir

Since it might change during a readdir call.

Checked on x86_64-linux-gnu and i686-linux-gnu.
---

diff --git a/sysdeps/posix/telldir.c b/sysdeps/posix/telldir.c
index 1bb822c8075..57d435ed21d 100644
--- a/sysdeps/posix/telldir.c
+++ b/sysdeps/posix/telldir.c
@@ -23,5 +23,11 @@
 long int
 telldir (DIR *dirp)
 {
-  return dirp->filepos;
+  long int ret;
+
+  __libc_lock_lock (dirp->lock);
+  ret = dirp->filepos;
+  __libc_lock_unlock (dirp->lock);
+
+  return ret;
 }