NULL out g_ceph_context when deleting it

This avoids a use-after-free when there is a crash on shutdown (or when
something like ASAN triggers an ABORT on leak).

Signed-off-by: Daniel Gryniewicz <dang@redhat.com>

diff --git a/src/common/ceph_context.cc b/src/common/ceph_context.cc
index d4248d9e9b1d9d288547a72f7710013dc91b4c7f..2e46507955c7bcc63711698c0e28c6fb3267b870 100644 (file)
--- a/src/common/ceph_context.cc
+++ b/src/common/ceph_context.cc
@@ -782,6 +782,8 @@ void CephContext::put() {
   if (--nref == 0) {
     ANNOTATE_HAPPENS_AFTER(&nref);
     ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(&nref);
+    if (g_ceph_context == this)
+      g_ceph_context = nullptr;
     delete this;
   } else {
     ANNOTATE_HAPPENS_BEFORE(&nref);