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NTFS: Fix a potential overflow by casting (index + 1) to s64 before doing a

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left shift using PAGE_CACHE_SHIFT in fs/ntfs/file.c.  Thanks to Andrew
      Morton pointing this out to.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-11-24 13:41:33 +00:00
parent 33bc227e4e
commit 3c6af7fa78
1 changed files with 1 additions and 1 deletions
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fs/ntfs/file.c
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@ -248,7 +248,7 @@ static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size,
* enough to make ntfs_writepage() work.
*/
write_lock_irqsave(&ni->size_lock, flags);
ni->initialized_size = (index + 1) << PAGE_CACHE_SHIFT;
ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
if (ni->initialized_size > new_init_size)
ni->initialized_size = new_init_size;
write_unlock_irqrestore(&ni->size_lock, flags);