diff options
| author | Nick Piggin <npiggin@suse.de> | 2007-07-20 00:31:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-20 08:44:19 -0700 |
| commit | 1833633803c7ef4d8f09877d3f1549cbd252f477 (patch) | |
| tree | ce69505de705701f838bd77c6b6b6bc18529bed0 | |
| parent | e228929bc257b963523ed75aa60d2ad77ece2189 (diff) | |
| download | op-kernel-dev-1833633803c7ef4d8f09877d3f1549cbd252f477.zip op-kernel-dev-1833633803c7ef4d8f09877d3f1549cbd252f477.tar.gz | |
fix some conversion overflows
Fix page index to offset conversion overflows in buffer layer, ecryptfs,
and ocfs2.
It would be nice to convert the whole tree to page_offset, but for now
just fix the bugs.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/buffer.c | 2 | ||||
| -rw-r--r-- | fs/ecryptfs/mmap.c | 5 | ||||
| -rw-r--r-- | fs/ocfs2/mmap.c | 2 |
3 files changed, 4 insertions, 5 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 02ebb1f..0e5ec37 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2221,7 +2221,7 @@ block_page_mkwrite(struct vm_area_struct *vma, struct page *page, lock_page(page); size = i_size_read(inode); if ((page->mapping != inode->i_mapping) || - ((page->index << PAGE_CACHE_SHIFT) > size)) { + (page_offset(page) > size)) { /* page got truncated out from underneath us */ goto out_unlock; } diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c index 7d5a43c..e4ab7bc 100644 --- a/fs/ecryptfs/mmap.c +++ b/fs/ecryptfs/mmap.c @@ -409,8 +409,7 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page, if (!PageUptodate(page)) rc = ecryptfs_do_readpage(file, page, page->index); if (page->index != 0) { - loff_t end_of_prev_pg_pos = - (((loff_t)page->index << PAGE_CACHE_SHIFT) - 1); + loff_t end_of_prev_pg_pos = page_offset(page) - 1; if (end_of_prev_pg_pos > i_size_read(page->mapping->host)) { rc = ecryptfs_truncate(file->f_path.dentry, @@ -736,7 +735,7 @@ static int ecryptfs_commit_write(struct file *file, struct page *page, goto out; } inode->i_blocks = lower_inode->i_blocks; - pos = (page->index << PAGE_CACHE_SHIFT) + to; + pos = page_offset(page) + to; if (pos > i_size_read(inode)) { i_size_write(inode, pos); ecryptfs_printk(KERN_DEBUG, "Expanded file size to " diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c index ee64749..9875615 100644 --- a/fs/ocfs2/mmap.c +++ b/fs/ocfs2/mmap.c @@ -89,7 +89,7 @@ static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh, { int ret; struct address_space *mapping = inode->i_mapping; - loff_t pos = page->index << PAGE_CACHE_SHIFT; + loff_t pos = page_offset(page); unsigned int len = PAGE_CACHE_SIZE; pgoff_t last_index; struct page *locked_page = NULL; |
