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Fix the memory leak that occurs when the nfscommon.ko module is unloaded.

Browse Source 
This leak was introduced by r291527.
Since the nfscommon.ko module is rarely unloaded, this leak would not
have been much of an issue.

MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2015-12-02 02:47:13 +00:00
parent e3c6864e80
commit 65171ebbc8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=291638
3 changed files with 52 additions and 0 deletions
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2
sys/fs/nfs/nfs_commonport.c
View File

@ -623,6 +623,8 @@ nfscommon_modevent(module_t mod, int type, void *data)
nfsd_call_nfscommon = NULL;
callout_drain(&newnfsd_callout);
/* Clean out the name<-->id cache. */
nfsrv_cleanusergroup();
/* and get rid of the mutexes */
mtx_destroy(&nfs_nameid_mutex);
mtx_destroy(&newnfsd_mtx);

49
sys/fs/nfs/nfs_commonsubs.c
View File

@ -3545,6 +3545,55 @@ nfsrv_removeuser(struct nfsusrgrp *usrp, int isuser)
free(usrp, M_NFSUSERGROUP);
}
/*
* Free up all the allocations related to the name<-->id cache.
* This function should only be called when the nfsuserd daemon isn't
* running, since it doesn't do any locking.
* This function is meant to be used when the nfscommon module is unloaded.
*/
APPLESTATIC void
nfsrv_cleanusergroup(void)
{
struct nfsrv_lughash *hp, *hp2;
struct nfsusrgrp *nusrp, *usrp;
int i;
if (nfsuserhash == NULL)
return;
for (i = 0; i < nfsrv_lughashsize; i++) {
hp = &nfsuserhash[i];
TAILQ_FOREACH_SAFE(usrp, &hp->lughead, lug_numhash, nusrp) {
TAILQ_REMOVE(&hp->lughead, usrp, lug_numhash);
hp2 = NFSUSERNAMEHASH(usrp->lug_name,
usrp->lug_namelen);
TAILQ_REMOVE(&hp2->lughead, usrp, lug_namehash);
if (usrp->lug_cred != NULL)
crfree(usrp->lug_cred);
free(usrp, M_NFSUSERGROUP);
}
hp = &nfsgrouphash[i];
TAILQ_FOREACH_SAFE(usrp, &hp->lughead, lug_numhash, nusrp) {
TAILQ_REMOVE(&hp->lughead, usrp, lug_numhash);
hp2 = NFSGROUPNAMEHASH(usrp->lug_name,
usrp->lug_namelen);
TAILQ_REMOVE(&hp2->lughead, usrp, lug_namehash);
if (usrp->lug_cred != NULL)
crfree(usrp->lug_cred);
free(usrp, M_NFSUSERGROUP);
}
mtx_destroy(&nfsuserhash[i].mtx);
mtx_destroy(&nfsusernamehash[i].mtx);
mtx_destroy(&nfsgroupnamehash[i].mtx);
mtx_destroy(&nfsgrouphash[i].mtx);
}
free(nfsuserhash, M_NFSUSERGROUP);
free(nfsusernamehash, M_NFSUSERGROUP);
free(nfsgrouphash, M_NFSUSERGROUP);
free(nfsgroupnamehash, M_NFSUSERGROUP);
free(nfsrv_dnsname, M_NFSSTRING);
}
/*
* This function scans a byte string and checks for UTF-8 compliance.
* It returns 0 if it conforms and NFSERR_INVAL if not.

1
sys/fs/nfs/nfs_var.h
View File

@ -283,6 +283,7 @@ void nfsv4_getref(struct nfsv4lock *, int *, void *, struct mount *);
int nfsv4_getref_nonblock(struct nfsv4lock *);
int nfsv4_testlock(struct nfsv4lock *);
int nfsrv_mtostr(struct nfsrv_descript *, char *, int);
void nfsrv_cleanusergroup(void);
int nfsrv_checkutf8(u_int8_t *, int);
int newnfs_sndlock(int *);
void newnfs_sndunlock(int *);