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fs: dlm: stop unnecessarily filling zero ms_extra bytes

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Commit 7175e131eb ("fs: dlm: fix invalid derefence of sb_lvbptr")
fixes an issue when the lkb->lkb_lvbptr set to an dangled pointer and an
followed memcpy() would fail. It was fixed by an additional check of
DLM_LKF_VALBLK flag. The mentioned commit forgot to add an additional check
if DLM_LKF_VALBLK is set for the additional amount of LVB data allocated
in a dlm message. This patch is changing the message allocation to check
additionally if DLM_LKF_VALBLK is set otherwise a dangled lkb->lkb_lvbptr
pointer would allocated zero LVB message data which not gets filled with
actual data.

This patch is however only a cleanup to reduce the amount of zero bytes
transmitted over network as receive_lvb() will only evaluates message LVB
data if DLM_LKF_VALBLK is set.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2023-04-21 11:55:52 -04:00 committed by David Teigland
parent 1361737f10
commit 7a40f1f18a
1 changed files with 1 additions and 1 deletions
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2
fs/dlm/lock.c
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@ -3381,7 +3381,7 @@ static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb,
case DLM_MSG_REQUEST_REPLY:
case DLM_MSG_CONVERT_REPLY:
case DLM_MSG_GRANT:
if (lkb && lkb->lkb_lvbptr)
if (lkb && lkb->lkb_lvbptr && (lkb->lkb_exflags & DLM_LKF_VALBLK))
mb_len += r->res_ls->ls_lvblen;
break;
}