From 679ff6a3e4ccb02efabf6f8564d11a3681a8c150 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Thu, 13 Jun 2019 15:17:00 -0400 Subject: [PATCH] ceph: return -ERANGE if virtual xattr value didn't fit in buffer [ Upstream commit 3b421018f48c482bdc9650f894aa1747cf90e51d ] 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 Reviewed-by: "Yan, Zheng" Acked-by: Ilya Dryomov Signed-off-by: Ilya Dryomov Signed-off-by: Sasha Levin --- fs/ceph/xattr.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index 75267cd..81144a8 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -74,7 +74,7 @@ static size_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); @@ -98,11 +98,8 @@ static size_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) { @@ -757,8 +754,11 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, vxattr = ceph_match_vxattr(inode, name); if (vxattr) { 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; } -- 2.7.4