1 files changed, 5 insertions, 2 deletions

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 09ac73c177fd..7d315fdb9f13 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -107,9 +107,12 @@ static inline bool fail_stacktrace(struct fault_attr *attr)
 
 bool should_fail(struct fault_attr *attr, ssize_t size)
 {
-        if (in_task() && current->fail_nth) {
-                if (--current->fail_nth == 0)
+        if (in_task()) {
+                unsigned int fail_nth = READ_ONCE(current->fail_nth);
+
+                if (fail_nth && !WRITE_ONCE(current->fail_nth, fail_nth - 1))
                         goto fail;
+
                 return false;
         }