d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Don't rely on the value of *statep without first taking the vnode interlock.

Browse Source 
Reviewed by:	Mike Tancsa
MFC after:	2 weeks
This commit is contained in:
dfr 2008-10-24 16:04:10 +00:00
parent 788640b731
commit f98e1f1bbf
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
sys/kern/kern_lockf.c
View File

@ -467,12 +467,15 @@ lf_advlockasync(struct vop_advlockasync_args *ap, struct lockf **statep,
/*
* Avoid the common case of unlocking when inode has no locks.
*/
if ((*statep) == NULL || LIST_EMPTY(&(*statep)->ls_active)) {
VI_LOCK(vp);
if ((*statep) == NULL) {
if (ap->a_op != F_SETLK) {
fl->l_type = F_UNLCK;
VI_UNLOCK(vp);
return (0);
}
}
VI_UNLOCK(vp);
/*
* Map our arguments to an existing lock owner or create one