zisofs: fix readpage() outside i_size

[sfrench/cifs-2.6.git] / fs / isofs / compress.c

diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 37dbd6404787b72c94513e66e7634166f2ebaa92..defb932eee9a9f45836ac2f62ee9dcf5f3838152 100644 (file)
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -72,6 +72,17 @@ static int zisofs_readpage(struct file *file, struct page *page)
        offset = index & ~zisofs_block_page_mask;
        blockindex = offset >> zisofs_block_page_shift;
        maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+       /*
+        * If this page is wholly outside i_size we just return zero;
+        * do_generic_file_read() will handle this for us
+        */
+       if (page->index >= maxpage) {
+               SetPageUptodate(page);
+               unlock_page(page);
+               return 0;
+       }
+
        maxpage = min(zisofs_block_pages, maxpage-offset);
 
        for ( i = 0 ; i < maxpage ; i++, offset++ ) {