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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-02 21:28:57 +0300 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-03 17:37:11 +0300 |
| commit | e9cc6c234bfe414ef36f484e3ad8be621854c440 (patch) | |
| tree | 8f1b6bf16c9f6b340fa398d39f55bcc51be4f05e /fs | |
| parent | b8c9a18712f7b617fda66d878ce3759c9e575ba0 (diff) | |
| download | linux-e9cc6c234bfe414ef36f484e3ad8be621854c440.tar.xz | |
NFS: Fix a possible Oops in fs/nfs/super.c
Sigh... commit 4584f520e1f773082ef44ff4f8969a5d992b16ec (NFS: Fix NFS
mountpoint crossing...) had a slight flaw: server can be NULL if sget()
returned an existing superblock.
Fix the fix by dereferencing s->s_fs_info.
Thanks to Coverity/Adrian Bunk and Frank Filz for spotting the bug.
(See http://bugzilla.kernel.org/show_bug.cgi?id=9647)
Also add in the same namespace Oops fix for NFSv4 in both the mountpoint
crossing case, and the referral case.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/super.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index ea929207f274..0b0c72a072ff 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1475,7 +1475,7 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, error = PTR_ERR(mntroot); goto error_splat_super; } - if (mntroot->d_inode->i_op != server->nfs_client->rpc_ops->dir_inode_ops) { + if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { dput(mntroot); error = -ESTALE; goto error_splat_super; @@ -1826,6 +1826,11 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, error = PTR_ERR(mntroot); goto error_splat_super; } + if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { + dput(mntroot); + error = -ESTALE; + goto error_splat_super; + } s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; @@ -1900,6 +1905,11 @@ static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, error = PTR_ERR(mntroot); goto error_splat_super; } + if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { + dput(mntroot); + error = -ESTALE; + goto error_splat_super; + } s->s_flags |= MS_ACTIVE; mnt->mnt_sb = s; |