It is OK for pageused == pagecount in the loop, as long as we don't add
another entry to the *pages array. Move the test so that it only triggers
in that case.
Reported-by: Steve Dickson <SteveD@xxxxxxxxxx>
Fixes: bba5c1887a92 (nfs: disallow duplicate pages in pgio page vectors)
Cc: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 3.16.x
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/pagelist.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 08085de879ed..ed0db61f8543 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -752,12 +752,11 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
nfs_list_remove_request(req);
nfs_list_add_request(req, &hdr->pages);
- if (WARN_ON_ONCE(pageused >= pagecount))
- return nfs_pgio_error(desc, hdr);
-
if (!last_page || last_page != req->wb_page) {
- *pages++ = last_page = req->wb_page;
pageused++;
+ if (pageused > pagecount)
+ break;
+ *pages++ = last_page = req->wb_page;
}
}
if (WARN_ON_ONCE(pageused != pagecount))
--
1.9.3
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