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ceph: return -ERANGE if virtual xattr value didn't fit in buffer

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[ Upstream commit 3b421018f4 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jeff Layton 2019-06-13 15:17:00 -04:00 committed by Greg Kroah-Hartman
parent b39c377ea0
commit c47e255260
1 changed files with 7 additions and 7 deletions
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14
fs/ceph/xattr.c
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@ -79,7 +79,7 @@ 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);
@ -103,11 +103,8 @@ 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) {
@ -817,8 +814,11 @@ 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;
}