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| author |   J. Bruce Fields <bfields@redhat.com> | 2016-07-19 17:33:04 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2016-08-04 17:11:48 -0400 |
| commit | e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c (patch) | |
| tree | f87cc0dee5dbb4f22fda8ab3c92dba6e83b75a29 /fs | |
| parent | nfsd: remove redundant zero-length check from create (diff) | |
| download | linux-dev-e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c.tar.xz linux-dev-e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c.zip | |
nfsd: check d_can_lookup in fh_verify of directories
Create and other nfsd ops generally assume we can call lookup_one_len on
inodes with S_IFDIR set. Al says that this assumption isn't true in
general, though it should be for the filesystem objects nfsd sees.
Add a check just to make sure our assumption isn't violated.
Remove a couple checks for i_op->lookup in create code.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfsfh.c | 14 | ||||
| -rw-r--r-- | fs/nfsd/vfs.c | 9 |
2 files changed, 10 insertions, 13 deletions
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index 27250e279c37..cfe7500d5847 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -59,14 +59,20 @@ static int nfsd_acceptable(void *expv, struct dentry *dentry) * the write call). */ static inline __be32 -nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested) +nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry, + umode_t requested) { - mode &= S_IFMT; + umode_t mode = d_inode(dentry)->i_mode & S_IFMT; if (requested == 0) /* the caller doesn't care */ return nfs_ok; - if (mode == requested) + if (mode == requested) { + if (mode == S_IFDIR && !d_can_lookup(dentry)) { + WARN_ON_ONCE(1); + return nfserr_notdir; + } return nfs_ok; + } /* * v4 has an error more specific than err_notdir which we should * return in preference to err_notdir: @@ -340,7 +346,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) if (error) goto out; - error = nfsd_mode_check(rqstp, d_inode(dentry)->i_mode, type); + error = nfsd_mode_check(rqstp, dentry, type); if (error) goto out; diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index fba8e7e521e0..cf14e394a1b0 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1169,9 +1169,6 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, dentry = fhp->fh_dentry; dirp = d_inode(dentry); - err = nfserr_notdir; - if (!dirp->i_op->lookup) - goto out; /* * Check whether the response file handle has been verified yet. * If it has, the parent directory should already be locked. @@ -1310,12 +1307,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, dentry = fhp->fh_dentry; dirp = d_inode(dentry); - /* Get all the sanity checks out of the way before - * we lock the parent. */ - err = nfserr_notdir; - if (!dirp->i_op->lookup) - goto out; - host_err = fh_want_write(fhp); if (host_err) goto out_nfserr; |