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| author |   Jeff Layton <jlayton@kernel.org> | 2019-06-13 15:17:00 -0400 |
|---|---|---|
| committer |   Ilya Dryomov <idryomov@gmail.com> | 2019-07-08 14:01:44 +0200 |
| commit | 3b421018f48c482bdc9650f894aa1747cf90e51d (patch) | |
| tree | 5876e406d919d5512256b4d5fe05d67d2074e2a6 /fs/ceph/xattr.c | |
| parent | ceph: make getxattr_cb return ssize_t (diff) | |
| download | linux-dev-3b421018f48c482bdc9650f894aa1747cf90e51d.tar.xz linux-dev-3b421018f48c482bdc9650f894aa1747cf90e51d.zip | |
ceph: return -ERANGE if virtual xattr value didn't fit in buffer
The getxattr manpage states that we should return ERANGE if the
destination buffer size is too small to hold the value.
ceph_vxattrcb_layout does this internally, but we should be doing
this for all vxattrs.
Fix the only caller of getxattr_cb to check the returned size
against the buffer length and return -ERANGE if it doesn't fit.
Drop the same check in ceph_vxattrcb_layout and just rely on the
caller to handle it.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/xattr.c')
| -rw-r--r-- | fs/ceph/xattr.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index e90e19e9660b..9b77dca0b786 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -63,7 +63,7 @@ static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, const char *ns_field = " pool_namespace="; char buf[128]; size_t len, total_len = 0; - int ret; + ssize_t ret; pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); @@ -87,11 +87,8 @@ static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, if (pool_ns) total_len += strlen(ns_field) + pool_ns->len; - if (!size) { - ret = total_len; - } else if (total_len > size) { - ret = -ERANGE; - } else { + ret = total_len; + if (size >= total_len) { memcpy(val, buf, len); ret = len; if (pool_name) { @@ -803,8 +800,11 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, if (err) return err; err = -ENODATA; - if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) + if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) { err = vxattr->getxattr_cb(ci, value, size); + if (size && size < err) + err = -ERANGE; + } return err; } |