SMB3: fix readpage for large swap cache
readpage was calculating the offset of the page incorrectly
for the case of large swapcaches.
loff_t offset = (loff_t)page->index << PAGE_SHIFT;
As pointed out by Matthew Wilcox, this needs to use
page_file_offset() to calculate the offset instead.
Pages coming from the swap cache have page->index set
to their index within the swapcache, not within the backing
file. For a sufficiently large swapcache, we could have
overlapping values of page->index within the same backing file.
Suggested by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: <stable@vger.kernel.org> # v5.7+
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index cd10860..0a72840 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -4619,7 +4619,7 @@ static int cifs_readpage_worker(struct file *file, struct page *page,
static int cifs_readpage(struct file *file, struct page *page)
{
- loff_t offset = (loff_t)page->index << PAGE_SHIFT;
+ loff_t offset = page_file_offset(page);
int rc = -EACCES;
unsigned int xid;