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| author | Jeff Layton <jlayton@kernel.org> | 2019-06-13 15:17:00 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-06 19:08:08 +0200 |
| commit | 35c1f07ca23370ef65d5c29ed9a02f07e65fbf1b (patch) | |
| tree | c40a98855c3c3eb23b1dbb012c8ff34bb602e7cc /fs/ceph/xattr.c | |
| parent | 1e1fab8df2aa44ae3377e0b0112179b85cb900ce (diff) | |
| download | linux-stable-35c1f07ca23370ef65d5c29ed9a02f07e65fbf1b.tar.gz linux-stable-35c1f07ca23370ef65d5c29ed9a02f07e65fbf1b.tar.bz2 linux-stable-35c1f07ca23370ef65d5c29ed9a02f07e65fbf1b.zip | |
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 <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>
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 0cc42c8879e9..0619adbcbe14 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -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) { @@ -835,8 +832,11 @@ 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; } |