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Subject[PATCH] mm: folio-compat: fix bug for pagecache_get_page
Date
The folio returned from __filemap_get_folio may be a NULL, it will
causes the kernel crash when access folio->page.

Signed-off-by: Tuo Cao <91tuocao@gmail.com>
---
mm/folio-compat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index e1e23b4947d7..37ba33135506 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -108,7 +108,7 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
struct folio *folio;

folio = __filemap_get_folio(mapping, index, fgp_flags, gfp);
- if ((fgp_flags & FGP_HEAD) || !folio || xa_is_value(folio))
+ if ((fgp_flags & FGP_HEAD) || xa_is_value(folio))
return &folio->page;
return folio_file_page(folio, index);
}
--
2.17.1
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