If the pages array contains encrypted pages, we cannot look at
page->index because that field is uninitialised. Instead, use the new
ceph_fscrypt_pagecache_folio() to get the pagecache folio and look at
the index of that.
Fixes: d55207717ded (ceph: add encryption support to writepage and writepages)
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/ceph/addr.c | 5 ++++-
fs/ceph/crypto.h | 7 +++++++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index f5224a566b69..80bc0cbacd7a 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1356,8 +1356,11 @@ static int ceph_writepages_start(struct address_space *mapping,
memset(data_pages + i, 0,
locked_pages * sizeof(*pages));
} else {
+ struct folio *folio;
+
BUG_ON(num_ops != req->r_num_ops);
- index = pages[i - 1]->index + 1;
+ folio = ceph_fscrypt_pagecache_folio(pages[i - 1]);
+ index = folio->index + 1;
/* request message now owns the pages array */
pages = NULL;
}
diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h
index d0768239a1c9..e4404ef589a1 100644
--- a/fs/ceph/crypto.h
+++ b/fs/ceph/crypto.h
@@ -280,6 +280,13 @@ static inline struct page *ceph_fscrypt_pagecache_page(struct page *page)
}
#endif /* CONFIG_FS_ENCRYPTION */
+static inline struct folio *ceph_fscrypt_pagecache_folio(struct page *page)
+{
+ if (fscrypt_is_bounce_page(page))
+ page = fscrypt_pagecache_page(page);
+ return page_folio(page);
+}
+
static inline loff_t ceph_fscrypt_page_offset(struct page *page)
{
return page_offset(ceph_fscrypt_pagecache_page(page));
--
2.47.2
