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nameicap_tracker_add: avoid duplicates in the tracker list

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Reviewed by:	markj
Tested by:	arichardson, pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D28907
This commit is contained in:
Konstantin Belousov 2021-02-28 02:13:19 +02:00
parent 59e7494281
commit 2388ad7c29
1 changed files with 3 additions and 0 deletions
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3
sys/kern/vfs_lookup.c
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@ -182,6 +182,9 @@ nameicap_tracker_add(struct nameidata *ndp, struct vnode *dp)
if ((ndp->ni_lcf & NI_LCF_CAP_DOTDOT) == 0 || dp->v_type != VDIR)
return;
cnp = &ndp->ni_cnd;
nt = TAILQ_LAST(&ndp->ni_cap_tracker, nameicap_tracker_head);
if (nt != NULL && nt->dp == dp)
return;
nt = malloc(sizeof(*nt), M_NAMEITRACKER, M_WAITOK);
vhold(dp);
nt->dp = dp;