linux-kernel - [PATCH] xa_load() needs a NULL check before locking check

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Message-Id: <20230215131417.150170-1-void0red@gmail.com>
Date:   Wed, 15 Feb 2023 21:14:17 +0800
From:   void0red <void0red@...il.com>
To:     willy@...radead.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        void0red <void0red@...il.com>
Subject: [PATCH] xa_load() needs a NULL check before locking check

Signed-off-by: void0red <void0red@...il.com>
---
 include/linux/pagemap.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index bbccb4044222..f1ddee3571de 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1250,6 +1250,10 @@ static inline struct folio *__readahead_folio(struct readahead_control *ractl)
 	}
 
 	folio = xa_load(&ractl->mapping->i_pages, ractl->_index);
+	if (!folio) {
+		VM_BUG_ON(!folio);
+		return NULL;
+	}
 	VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
 	ractl->_batch_count = folio_nr_pages(folio);
 
-- 
2.34.1