From: void0red <void0red@gmail.com>
To: willy@infradead.org
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
void0red <void0red@gmail.com>
Subject: [PATCH] xa_load() needs a NULL check before locking check
Date: Wed, 15 Feb 2023 21:14:17 +0800 [thread overview]
Message-ID: <20230215131417.150170-1-void0red@gmail.com> (raw)
Signed-off-by: void0red <void0red@gmail.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
next reply other threads:[~2023-02-15 13:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-15 13:14 void0red [this message]
2023-02-15 13:31 ` [PATCH] xa_load() needs a NULL check before locking check Matthew Wilcox
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