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libceph: check reply num_data_items in setup_request_data()

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setup_request_data() adds message data items to both request and reply
messages, but only checks request num_data_items before proceeding with
the loop.  This is wrong because if an op doesn't have any request data
items but has a reply data item (e.g. read), a duplicate data item gets
added to the message on every resend attempt.

This went unnoticed for years but now that message data items are
preallocated, it promptly crashes in ceph_msg_data_add().  Amend the
signature to make it clear that setup_request_data() operates on both
request and reply messages.  Also, remove data_len assert -- we have
another one in prepare_write_message().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2018-10-17 14:23:04 +02:00
parent 0d9c1ab3be
commit 98c4bfe9d8
1 changed files with 23 additions and 25 deletions
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48
net/ceph/osd_client.c
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@ -1917,48 +1917,48 @@ static bool should_plug_request(struct ceph_osd_request *req)
/*
* Keep get_num_data_items() in sync with this function.
*/
static void setup_request_data(struct ceph_osd_request *req,
struct ceph_msg *msg)
static void setup_request_data(struct ceph_osd_request *req)
{
u32 data_len = 0;
int i;
struct ceph_msg *request_msg = req->r_request;
struct ceph_msg *reply_msg = req->r_reply;
struct ceph_osd_req_op *op;
if (msg->num_data_items)
if (req->r_request->num_data_items || req->r_reply->num_data_items)
return;
WARN_ON(msg->data_length);
for (i = 0; i < req->r_num_ops; i++) {
struct ceph_osd_req_op *op = &req->r_ops[i];
WARN_ON(request_msg->data_length || reply_msg->data_length);
for (op = req->r_ops; op != &req->r_ops[req->r_num_ops]; op++) {
switch (op->op) {
/* request */
case CEPH_OSD_OP_WRITE:
case CEPH_OSD_OP_WRITEFULL:
WARN_ON(op->indata_len != op->extent.length);
ceph_osdc_msg_data_add(msg, &op->extent.osd_data);
ceph_osdc_msg_data_add(request_msg,
&op->extent.osd_data);
break;
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
WARN_ON(op->indata_len != op->xattr.name_len +
op->xattr.value_len);
ceph_osdc_msg_data_add(msg, &op->xattr.osd_data);
ceph_osdc_msg_data_add(request_msg,
&op->xattr.osd_data);
break;
case CEPH_OSD_OP_NOTIFY_ACK:
ceph_osdc_msg_data_add(msg,
ceph_osdc_msg_data_add(request_msg,
&op->notify_ack.request_data);
break;
/* reply */
case CEPH_OSD_OP_STAT:
ceph_osdc_msg_data_add(req->r_reply,
ceph_osdc_msg_data_add(reply_msg,
&op->raw_data_in);
break;
case CEPH_OSD_OP_READ:
ceph_osdc_msg_data_add(req->r_reply,
ceph_osdc_msg_data_add(reply_msg,
&op->extent.osd_data);
break;
case CEPH_OSD_OP_LIST_WATCHERS:
ceph_osdc_msg_data_add(req->r_reply,
ceph_osdc_msg_data_add(reply_msg,
&op->list_watchers.response_data);
break;
@ -1967,25 +1967,23 @@ static void setup_request_data(struct ceph_osd_request *req,
WARN_ON(op->indata_len != op->cls.class_len +
op->cls.method_len +
op->cls.indata_len);
ceph_osdc_msg_data_add(msg, &op->cls.request_info);
ceph_osdc_msg_data_add(request_msg,
&op->cls.request_info);
/* optional, can be NONE */
ceph_osdc_msg_data_add(msg, &op->cls.request_data);
ceph_osdc_msg_data_add(request_msg,
&op->cls.request_data);
/* optional, can be NONE */
ceph_osdc_msg_data_add(req->r_reply,
ceph_osdc_msg_data_add(reply_msg,
&op->cls.response_data);
break;
case CEPH_OSD_OP_NOTIFY:
ceph_osdc_msg_data_add(msg,
ceph_osdc_msg_data_add(request_msg,
&op->notify.request_data);
ceph_osdc_msg_data_add(req->r_reply,
ceph_osdc_msg_data_add(reply_msg,
&op->notify.response_data);
break;
}
data_len += op->indata_len;
}
WARN_ON(data_len != msg->data_length);
}
static void encode_pgid(void **p, const struct ceph_pg *pgid)
@ -2033,7 +2031,7 @@ static void encode_request_partial(struct ceph_osd_request *req,
req->r_data_offset || req->r_snapc);
}
setup_request_data(req, msg);
setup_request_data(req);
encode_spgid(&p, &req->r_t.spgid); /* actual spg */
ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */