[PATCH] NFS: large non-page-aligned direct I/O clobbers memory

The logic in nfs_direct_read_schedule and nfs_direct_write_schedule can
allow data->npages to be one larger than rpages.  This causes a page
pointer to be written beyond the end of the pagevec in nfs_read_data (or
nfs_write_data).

Fix this by making nfs_(read|write)_alloc() calculate the size of the
pagevec array, and initialise data->npages.

Also get rid of the redundant argument to nfs_commit_alloc().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 247434553ae8..530b1e6173b1 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -427,7 +427,7 @@ extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 extern void nfs_writedata_release(void *);
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
+struct nfs_write_data *nfs_commit_alloc(void);
 void nfs_commit_free(struct nfs_write_data *p);
 #endif
 
@@ -478,7 +478,7 @@ static inline int nfs_wb_page(struct inode *inode, struct page* page)
 /*
  * Allocate nfs_write_data structures
  */
-extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
+extern struct nfs_write_data *nfs_writedata_alloc(size_t len);
 
 /*
  * linux/fs/nfs/read.c
@@ -492,7 +492,7 @@ extern void nfs_readdata_release(void *data);
 /*
  * Allocate nfs_read_data structures
  */
-extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
+extern struct nfs_read_data *nfs_readdata_alloc(size_t len);
 
 /*
  * linux/fs/nfs3proc.c