dlm: receive_rcom_lock_args() overflow check

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6c605fc..0593dd8 100644 (file)
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -4271,7 +4271,6 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
                                  struct dlm_rsb *r, struct dlm_rcom *rc)
 {
        struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
-       int lvblen;
 
        lkb->lkb_nodeid = rc->rc_header.h_nodeid;
        lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid);
@@ -4288,11 +4287,13 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
        lkb->lkb_astaddr = (void *) (long) (rl->rl_asts & AST_COMP);
 
        if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
+               int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
+                        sizeof(struct rcom_lock);
+               if (lvblen > ls->ls_lvblen)
+                       return -EINVAL;
                lkb->lkb_lvbptr = dlm_allocate_lvb(ls);
                if (!lkb->lkb_lvbptr)
                        return -ENOMEM;
-               lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
-                        sizeof(struct rcom_lock);
                memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen);
        }