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authorJ. Bruce Fields <bfields@redhat.com>2014-06-20 11:52:21 -0400
committerJ. Bruce Fields <bfields@redhat.com>2014-07-08 17:14:23 -0400
commit52ee04330f585d1b5bc40442f07df07248fa3aee (patch)
tree6a176680872e4bc505cdf410645afe9252ad2619 /fs/nfsd/vfs.c
parent0aeae33f5d5fbd4af775e7c84795db9254d4a165 (diff)
downloadop-kernel-dev-52ee04330f585d1b5bc40442f07df07248fa3aee.zip
op-kernel-dev-52ee04330f585d1b5bc40442f07df07248fa3aee.tar.gz
nfsd: let nfsd_symlink assume null-terminated data
Currently nfsd_symlink has a weird hack to serve callers who don't null-terminate symlink data: it looks ahead at the next byte to see if it's zero, and copies it to a new buffer to null-terminate if not. That means callers don't have to null-terminate, but they *do* have to ensure that the byte following the end of the data is theirs to read. That's a bit subtle, and the NFSv4 code actually got this wrong. So let's just throw out that code and let callers pass null-terminated strings; we've already fixed them to do that. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c17
1 files changed, 3 insertions, 14 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6ffaa70..7518c65 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1504,7 +1504,7 @@ out_nfserr:
__be32
nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
char *fname, int flen,
- char *path, int plen,
+ char *path,
struct svc_fh *resfhp,
struct iattr *iap)
{
@@ -1513,7 +1513,7 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
int host_err;
err = nfserr_noent;
- if (!flen || !plen)
+ if (!flen || path[0] == '\0')
goto out;
err = nfserr_exist;
if (isdotent(fname, flen))
@@ -1534,18 +1534,7 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (IS_ERR(dnew))
goto out_nfserr;
- if (unlikely(path[plen] != 0)) {
- char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
- if (path_alloced == NULL)
- host_err = -ENOMEM;
- else {
- strncpy(path_alloced, path, plen);
- path_alloced[plen] = 0;
- host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
- kfree(path_alloced);
- }
- } else
- host_err = vfs_symlink(dentry->d_inode, dnew, path);
+ host_err = vfs_symlink(dentry->d_inode, dnew, path);
err = nfserrno(host_err);
if (!err)
err = nfserrno(commit_metadata(fhp));
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