iomap: Add another assertion to inline data handling

Check that the file tail does not cross a page boundary.  Requested by
Andreas.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 8ee0211..586d9d0 100644 (file)
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -215,6 +215,8 @@ static int iomap_read_inline_data(struct inode *inode, struct page *page,
        if (PageUptodate(page))
                return PAGE_SIZE - poff;
 
+       if (WARN_ON_ONCE(size > PAGE_SIZE - poff))
+               return -EIO;
        if (WARN_ON_ONCE(size > PAGE_SIZE -
                         offset_in_page(iomap->inline_data)))
                return -EIO;