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NFS: readdir shouldn't read beyond the reply returned by the server

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2010-11-15 20:26:22 -05:00
parent 8cd51a0ccd
commit ac39612824
5 changed files with 11 additions and 7 deletions
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4
fs/nfs/dir.c
View File

@ -573,11 +573,13 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
if (!pages_ptr)
goto out_release_array;
do {
unsigned int pglen;
status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
if (status < 0)
break;
status = nfs_readdir_page_filler(desc, &entry, pages_ptr, page, array_size * PAGE_SIZE);
pglen = status;
status = nfs_readdir_page_filler(desc, &entry, pages_ptr, page, pglen);
if (status < 0) {
if (status == -ENOSPC)
status = 0;

4
fs/nfs/nfs2xdr.c
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@ -423,7 +423,7 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
struct page **page;
size_t hdrlen;
unsigned int pglen, recvd;
int status, nr = 0;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
@ -443,7 +443,7 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
return nr;
return pglen;
}
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)

4
fs/nfs/nfs3xdr.c
View File

@ -555,7 +555,7 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
struct page **page;
size_t hdrlen;
u32 recvd, pglen;
int status, nr = 0;
int status;
status = ntohl(*p++);
/* Decode post_op_attrs */
@ -586,7 +586,7 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
pglen = recvd;
page = rcvbuf->pages;
return nr;
return pglen;
}
__be32 *

4
fs/nfs/nfs4proc.c
View File

@ -2852,8 +2852,10 @@ static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
res.pgbase = args.pgbase;
status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
if (status == 0)
if (status >= 0) {
memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
status += args.pgbase;
}
nfs_invalidate_atime(dir);

2
fs/nfs/nfs4xdr.c
View File

@ -4518,7 +4518,7 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
xdr_read_pages(xdr, pglen);
return 0;
return pglen;
}
static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)