Messages in this thread Patch in this message | | | From | void0red <> | Subject | [PATCH] xa_load() needs a NULL check before locking check | Date | Wed, 15 Feb 2023 21:14:17 +0800 |
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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
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