From: Alexander Aring aahringo@redhat.com
commit 44637ca41d551d409a481117b07fa209b330fca9 upstream.
During lock arg validation, first check for -EBUSY cases, then for -EINVAL cases. The -EINVAL checks look at lkb state variables which are not stable when an lkb is busy and would cause an -EBUSY result, e.g. lkb->lkb_grmode.
Cc: stable@vger.kernel.org Signed-off-by: Alexander Aring aahringo@redhat.com Signed-off-by: David Teigland teigland@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/dlm/lock.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
--- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -2864,17 +2864,9 @@ static int set_unlock_args(uint32_t flag static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, struct dlm_args *args) { - int rv = -EINVAL; + int rv = -EBUSY;
if (args->flags & DLM_LKF_CONVERT) { - if (lkb->lkb_flags & DLM_IFL_MSTCPY) - goto out; - - if (args->flags & DLM_LKF_QUECVT && - !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1]) - goto out; - - rv = -EBUSY; if (lkb->lkb_status != DLM_LKSTS_GRANTED) goto out;
@@ -2884,6 +2876,14 @@ static int validate_lock_args(struct dlm
if (is_overlap(lkb)) goto out; + + rv = -EINVAL; + if (lkb->lkb_flags & DLM_IFL_MSTCPY) + goto out; + + if (args->flags & DLM_LKF_QUECVT && + !__quecvt_compat_matrix[lkb->lkb_grmode+1][args->mode+1]) + goto out; }
lkb->lkb_exflags = args->flags;