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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-04-10 09:26:35 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-04-30 22:17:07 -0700 |
| commit | 8d5658c949e6d89edc579a1f112aeee3bc232a8e (patch) | |
| tree | f206d3f6809eeb0ca23c1999cf79aa294968b113 /fs/nfs/internal.h | |
| parent | c63c7b051395368573779c8309aa5c990dcf2f96 (diff) | |
| download | lwn-8d5658c949e6d89edc579a1f112aeee3bc232a8e.tar.gz lwn-8d5658c949e6d89edc579a1f112aeee3bc232a8e.zip | |
NFS: Fix a buffer overflow in the allocation of struct nfs_read/writedata
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
| -rw-r--r-- | fs/nfs/internal.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 6610f2b02077..ad2b40db1e65 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -231,3 +231,15 @@ unsigned int nfs_page_length(struct page *page) } return 0; } + +/* + * Determine the number of pages in an array of length 'len' and + * with a base offset of 'base' + */ +static inline +unsigned int nfs_page_array_len(unsigned int base, size_t len) +{ + return ((unsigned long)len + (unsigned long)base + + PAGE_SIZE - 1) >> PAGE_SHIFT; +} + |