Re: [syzbot] [mm?] [f2fs?] [exfat?] memory leak in __kfree_rcu_sheaf

[David Timber]

#syz testdiff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index c4c225e09dc4..7aba99e1f93f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4595,6 +4595,12 @@ void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
 		return;
 	if (!test_bit(error, (unsigned long *)sbi->errors))
 		return;
+
+	if (unlikely(is_sbi_flag_set(sbi, SBI_IS_CLOSE))) {
+		f2fs_warn(sbi, "f2fs_handle_error() called upon sb_put");
+		return;
+	}
+
 	schedule_work(&sbi->s_error_work);
 }
 
@@ -4621,7 +4627,10 @@ void f2fs_handle_critical_error(struct f2fs_sb_info *sbi, unsigned char reason)
 		 * in order to avoid potential deadlock when running into
 		 * f2fs_record_stop_reason() synchronously.
 		 */
-		schedule_work(&sbi->s_error_work);
+		if (unlikely(is_sbi_flag_set(sbi, SBI_IS_CLOSE)))
+			f2fs_warn(sbi, "f2fs_handle_critical_error() called upon sb_put");
+		else
+			schedule_work(&sbi->s_error_work);
 	}
 
 	/*