[PATCH] fix possible PAGE_CACHE_SHIFT overflows

[deliverable/linux.git] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 263df0f192aa2bdcf458810669c370a48385213b..55f0975a9b15dc61ac3815ec316a5fa4f8adf1a8 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1762,7 +1762,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
         * handle that here by just cleaning them.
         */
 
-       block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+       block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
        head = page_buffers(page);
        bh = head;
 
@@ -2635,7 +2635,7 @@ int block_truncate_page(struct address_space *mapping,
        pgoff_t index = from >> PAGE_CACHE_SHIFT;
        unsigned offset = from & (PAGE_CACHE_SIZE-1);
        unsigned blocksize;
-       pgoff_t iblock;
+       sector_t iblock;
        unsigned length, pos;
        struct inode *inode = mapping->host;
        struct page *page;
@@ -2651,7 +2651,7 @@ int block_truncate_page(struct address_space *mapping,
                return 0;
 
        length = blocksize - length;
-       iblock = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+       iblock = (sector_t)index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
        
        page = grab_cache_page(mapping, index);
        err = -ENOMEM;