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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-04-10 09:26:35 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-04-30 22:17:07 -0700
commit8d5658c949e6d89edc579a1f112aeee3bc232a8e (patch)
treef206d3f6809eeb0ca23c1999cf79aa294968b113 /fs/nfs/internal.h
parentc63c7b051395368573779c8309aa5c990dcf2f96 (diff)
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.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 6610f2b0207..ad2b40db1e6 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;
+}
+