From b434eda6fda5bcdcc2dd918e5ffbf7184f2d4e17 Mon Sep 17 00:00:00 2001 From: Patrick Caulfield Date: Mon, 1 Oct 2007 15:28:42 +0100 Subject: [DLM] don't overwrite castparam if it's NULL If the castaddr passed to the userland API is NULL then don't overwrite the existing castparam. This allows a different thread to cancel a lock request and the CANCEL AST gets delivered to the original thread. bz#306391 (for RHEL4) refers. Signed-Off-By: Patrick Caulfield Signed-off-by: Steven Whitehouse --- fs/dlm/lock.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'fs/dlm') diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 2082daf083d..031229f144f 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -4429,7 +4429,8 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, if (lvb_in && ua->lksb.sb_lvbptr) memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN); - ua->castparam = ua_tmp->castparam; + if (ua_tmp->castparam) + ua->castparam = ua_tmp->castparam; ua->user_lksb = ua_tmp->user_lksb; error = set_unlock_args(flags, ua, &args); @@ -4474,7 +4475,8 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, goto out; ua = (struct dlm_user_args *)lkb->lkb_astparam; - ua->castparam = ua_tmp->castparam; + if (ua_tmp->castparam) + ua->castparam = ua_tmp->castparam; ua->user_lksb = ua_tmp->user_lksb; error = set_unlock_args(flags, ua, &args); -- cgit v1.2.3-18-g5258