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SMB3: fix readpage for large swap cache

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commit f2a26a3cff27dfa456fef386fe5df56dcb4b47b6 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steve French 2021-07-23 18:35:15 -05:00 committed by AuxXxilium
parent 682f75d35f
commit 705eac042f
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/file.c
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@ -4560,7 +4560,7 @@ 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;