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| author | Chuck Lever <chuck.lever@oracle.com> | 2011-01-21 03:05:38 +0000 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-25 15:24:47 -0500 |
| commit | f61f6da0d53842e849bab7f69e1431bd3de1136d (patch) | |
| tree | 8433904f645695338b98d3dc831631ffd6f129e5 /fs/nfs/nfs3acl.c | |
| parent | 731f3f482ad3b2c58a1af2d0a9a634a82803706a (diff) | |
| download | lwn-f61f6da0d53842e849bab7f69e1431bd3de1136d.tar.gz lwn-f61f6da0d53842e849bab7f69e1431bd3de1136d.zip | |
NFS: Prevent memory allocation failure in nfsacl_encode()
nfsacl_encode() allocates memory in certain cases. This of course
is not guaranteed to work.
Since commit 9f06c719 "SUNRPC: New xdr_streams XDR encoder API", the
kernel's XDR encoders can't return a result indicating possibly a
failure, so a memory allocation failure in nfsacl_encode() has become
fatal (ie, the XDR code Oopses) in some cases.
However, the allocated memory is a tiny fixed amount, on the order
of 40-50 bytes. We can easily use a stack-allocated buffer for
this, with only a wee bit of nose-holding.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs3acl.c')
| -rw-r--r-- | fs/nfs/nfs3acl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c index 9f88c5f4c7e2..274342771655 100644 --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -311,8 +311,8 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, if (!nfs_server_capable(inode, NFS_CAP_ACLS)) goto out; - /* We are doing this here, because XDR marshalling can only - return -ENOMEM. */ + /* We are doing this here because XDR marshalling does not + * return any results, it BUGs. */ status = -ENOSPC; if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) goto out; |