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authorIlya Dryomov <idryomov@gmail.com>2015-09-14 15:01:05 +0200
committerIlya Dryomov <idryomov@gmail.com>2015-09-17 19:14:15 +0200
commit7f61f545657281a3a1b0faf68993165ebdecc51b (patch)
treed405e22c3eaeb3cb6071ca0fa46b4e8c7c909350 /net/ceph/messenger.c
parentLinux 4.3-rc1 (diff)
downloadlinux-7f61f545657281a3a1b0faf68993165ebdecc51b.tar.xz
linux-7f61f545657281a3a1b0faf68993165ebdecc51b.zip
libceph: don't access invalid memory in keepalive2 path
This struct ceph_timespec ceph_ts; ... con_out_kvec_add(con, sizeof(ceph_ts), &ceph_ts); wraps ceph_ts into a kvec and adds it to con->out_kvec array, yet ceph_ts becomes invalid on return from prepare_write_keepalive(). As a result, we send out bogus keepalive2 stamps. Fix this by encoding into a ceph_timespec member, similar to how acks are read and written. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'net/ceph/messenger.c')
-rw-r--r--net/ceph/messenger.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 525f454f7531..b9b0e3b5da49 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1353,11 +1353,12 @@ static void prepare_write_keepalive(struct ceph_connection *con)
dout("prepare_write_keepalive %p\n", con);
con_out_kvec_reset(con);
if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
- struct timespec ts = CURRENT_TIME;
- struct ceph_timespec ceph_ts;
- ceph_encode_timespec(&ceph_ts, &ts);
+ struct timespec now = CURRENT_TIME;
+
con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
- con_out_kvec_add(con, sizeof(ceph_ts), &ceph_ts);
+ ceph_encode_timespec(&con->out_temp_keepalive2, &now);
+ con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
+ &con->out_temp_keepalive2);
} else {
con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
}