From 8d5658c949e6d89edc579a1f112aeee3bc232a8e Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 10 Apr 2007 09:26:35 -0400 Subject: NFS: Fix a buffer overflow in the allocation of struct nfs_read/writedata Signed-off-by: Trond Myklebust --- fs/nfs/internal.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'fs/nfs/internal.h') 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; +} + -- cgit v1.2.3