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authorIlya Dryomov <ilya.dryomov@inktank.com>2014-01-09 20:08:21 +0200
committerJiri Slaby <jslaby@suse.cz>2014-03-31 14:22:36 +0200
commit4c3280ca0ee91125e8f086d33d879065222d6daa (patch)
tree75d2be832c96e7abf000c4fac90be22d33eccd43
parented0d7f08ff8b76555525a9ee61d8eed2796594c2 (diff)
libceph: fix preallocation check in get_reply()
commit f2be82b0058e90b5d9ac2cb896b4914276fb50ef upstream. 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> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
-rw-r--r--net/ceph/messenger.c3
-rw-r--r--net/ceph/osd_client.c4
2 files changed, 3 insertions, 4 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 30db7a69f061..464303f61730 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -3126,7 +3126,6 @@ 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,
@@ -3143,7 +3142,7 @@ 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 2efae981acd5..e6b2db68b4fa 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2515,9 +2515,9 @@ 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,