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| author | Ilya Dryomov <ilya.dryomov@inktank.com> | 2014-01-09 19:08:21 +0100 |
|---|---|---|
| committer | Ilya Dryomov <ilya.dryomov@inktank.com> | 2014-01-14 10:27:47 +0100 |
| commit | f2be82b0058e90b5d9ac2cb896b4914276fb50ef (patch) | |
| tree | 0754bf0d97cb300fc611a2ce4527649f29cc41c6 /net/ceph | |
| parent | libceph: rename front to front_len in get_reply() (diff) | |
| download | linux-f2be82b0058e90b5d9ac2cb896b4914276fb50ef.tar.xz linux-f2be82b0058e90b5d9ac2cb896b4914276fb50ef.zip | |
libceph: fix preallocation check in get_reply()
The check that makes sure that we have enough memory allocated to read
in the entire header of the message in question is currently busted.
It compares front_len of the incoming message with iov_len field of
ceph_msg::front structure, which is used primarily to indicate the
amount of data already read in, and not the size of the allocated
buffer. Under certain conditions (e.g. a short read from a socket
followed by that socket's shutdown and owning ceph_connection reset)
this results in a warning similar to
[85688.975866] libceph: get_reply front 198 > preallocated 122 (4#0)
and, through another bug, leads to forever hung tasks and forced
reboots. Fix this by comparing front_len with front_alloc_len field of
struct ceph_msg, which stores the actual size of the buffer.
Fixes: http://tracker.ceph.com/issues/5425
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'net/ceph')
| -rw-r--r-- | net/ceph/messenger.c | 3 | ||||
| -rw-r--r-- | net/ceph/osd_client.c | 4 |
2 files changed, 3 insertions, 4 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index f4d411c017e7..252ad4e01cf8 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -3130,7 +3130,6 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, INIT_LIST_HEAD(&m->data); /* front */ - m->front_alloc_len = front_len; if (front_len) { if (front_len > PAGE_CACHE_SIZE) { m->front.iov_base = __vmalloc(front_len, flags, @@ -3147,7 +3146,7 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, } else { m->front.iov_base = NULL; } - m->front.iov_len = front_len; + m->front_alloc_len = m->front.iov_len = front_len; dout("ceph_msg_new %p front %d\n", m, front_len); return m; diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 7619c37bfed4..733195170490 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -2522,9 +2522,9 @@ static struct ceph_msg *get_reply(struct ceph_connection *con, req->r_reply, req->r_reply->con); ceph_msg_revoke_incoming(req->r_reply); - if (front_len > req->r_reply->front.iov_len) { + if (front_len > req->r_reply->front_alloc_len) { pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n", - front_len, (int)req->r_reply->front.iov_len, + front_len, req->r_reply->front_alloc_len, (unsigned int)con->peer_name.type, le64_to_cpu(con->peer_name.num)); m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS, |