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authorAl Viro <viro@zeniv.linux.org.uk>2008-01-25 20:22:22 -0500
committerDavid Teigland <teigland@redhat.com>2008-02-04 01:25:58 -0600
commita5dd06313dbcec3a2c8a5e4a6f3ddb2a8fc72ec9 (patch)
tree50927394b52a4fa2d01cb9300cd49c3bb2f014c2 /fs/dlm/lock.c
parentae773d0b74bf2244887a6d0504372748381ab9c7 (diff)
downloadlinux-linaro-stable-a5dd06313dbcec3a2c8a5e4a6f3ddb2a8fc72ec9.tar.gz
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>
Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6c605fc10613..0593dd81d46d 100644
--- 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);
}