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authorNiels de Vos <ndevos@redhat.com>2017-07-03 16:24:53 +0200
committerNiels de Vos <ndevos@redhat.com>2017-07-09 09:13:44 +0000
commit01bfdd4d1759423681d311da33f4ac2346ace445 (patch)
treecedb8980f9f1cfb911048fd8c01ae93be7e39cc4 /xlators/nfs/server/src/nlm4.c
parentfafe1491ead527ba1024c521013aa90d2ee2b355 (diff)
nfs/nlm: use refcounting for nfs3_call_state_t
In order to track down a potential use-after-free of the nfs3_call_state_t structure in the NLM component, add reference counting where teh structure is used. This should prevent premature free'ing of the structure. Change-Id: Ib1f13b0463ab1e012b7b49a623c91f0f3e73e1fb BUG: 1467313 Signed-off-by: Niels de Vos <ndevos@redhat.com> Reviewed-on: https://review.gluster.org/17699 Reviewed-by: jiffin tony Thottan <jthottan@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Diffstat (limited to 'xlators/nfs/server/src/nlm4.c')
-rw-r--r--xlators/nfs/server/src/nlm4.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/xlators/nfs/server/src/nlm4.c b/xlators/nfs/server/src/nlm4.c
index fab9e62..f237f1a 100644
--- a/xlators/nfs/server/src/nlm4.c
+++ b/xlators/nfs/server/src/nlm4.c
@@ -528,8 +528,11 @@ nlm4_file_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
fd_bind (cs->fd);
cs->resolve_ret = op_ret;
cs->resume_fn (cs);
+
frame->local = NULL;
STACK_DESTROY (frame->root);
+ GF_REF_PUT (cs);
+
return 0;
}
@@ -669,7 +672,7 @@ nlm4_file_open_and_resume(nfs3_call_state_t *cs, nlm4_resume_fn_t resume)
frame->root->pid = NFS_PID;
frame->root->uid = rpcsvc_request_uid (cs->req);
frame->root->gid = rpcsvc_request_gid (cs->req);
- frame->local = cs;
+ frame->local = GF_REF_GET (cs);
nfs_fix_groups (cs->nfsx, frame->root);
STACK_WIND_COOKIE (frame, nlm4_file_open_cbk, cs->vol, cs->vol,
@@ -806,7 +809,7 @@ nlm4_test_fd_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nfs_request_user_init (&nfu, cs->req);
nlm4_lock_to_gf_flock (&flock, &cs->args.nlm4_testargs.alock,
cs->args.nlm4_testargs.exclusive);
@@ -814,6 +817,8 @@ nlm4_test_fd_resume (void *carg)
ret = nfs_lk (cs->nfsx, cs->vol, &nfu, cs->fd, F_GETLK, &flock,
nlm4svc_test_cbk, cs);
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -829,7 +834,7 @@ nlm4_test_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nlm4_check_fh_resolve_status (cs, stat, nlm4err);
fd = fd_anonymous (cs->resolvedloc.inode);
if (!fd)
@@ -846,6 +851,8 @@ nlm4err:
nfs3_call_state_wipe (cs);
}
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -1371,7 +1378,7 @@ nlm4_lock_fd_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nlm4_check_fh_resolve_status (cs, stat, nlm4err);
(void) nlm_search_and_add (cs->fd,
cs->args.nlm4_lockargs.alock.caller_name);
@@ -1402,6 +1409,8 @@ nlm4err:
nfs3_call_state_wipe (cs);
}
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -1416,7 +1425,7 @@ nlm4_lock_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nlm4_check_fh_resolve_status (cs, stat, nlm4err);
ret = nlm4_file_open_and_resume (cs, nlm4_lock_fd_resume);
@@ -1430,6 +1439,8 @@ nlm4err:
nfs3_call_state_wipe (cs);
}
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -1549,7 +1560,7 @@ nlm4_cancel_fd_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nfs_request_user_init (&nfu, cs->req);
nlm4_lock_to_gf_flock (&flock, &cs->args.nlm4_cancargs.alock,
cs->args.nlm4_cancargs.exclusive);
@@ -1558,6 +1569,8 @@ nlm4_cancel_fd_resume (void *carg)
ret = nfs_lk (cs->nfsx, cs->vol, &nfu, cs->fd, F_SETLK,
&flock, nlm4svc_cancel_cbk, cs);
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -1572,7 +1585,7 @@ nlm4_cancel_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nlm4_check_fh_resolve_status (cs, stat, nlm4err);
nlmclnt = nlm_get_uniq (cs->args.nlm4_cancargs.alock.caller_name);
@@ -1599,6 +1612,9 @@ nlm4err:
nfs3_call_state_wipe (cs);
}
+
+ GF_REF_PUT (cs);
+
/* clean up is taken care of */
return 0;
}
@@ -1674,7 +1690,7 @@ nlm4svc_unlock_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
nlm4_stats stat = nlm4_denied;
nfs3_call_state_t *cs = NULL;
- cs = frame->local;
+ cs = GF_REF_GET ((nfs3_call_state_t*) frame->local);
if (op_ret == -1) {
stat = nlm4_errno_to_nlm4stat (op_errno);
goto err;
@@ -1687,7 +1703,7 @@ nlm4svc_unlock_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
err:
nlm4_generic_reply (cs->req, cs->args.nlm4_unlockargs.cookie, stat);
- nfs3_call_state_wipe (cs);
+ GF_REF_PUT (cs);
return 0;
}
@@ -1701,7 +1717,7 @@ nlm4_unlock_fd_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nfs_request_user_init (&nfu, cs->req);
nlm4_lock_to_gf_flock (&flock, &cs->args.nlm4_unlockargs.alock, 0);
nlm_copy_lkowner (&nfu.lk_owner, &cs->args.nlm4_unlockargs.alock.oh);
@@ -1709,6 +1725,8 @@ nlm4_unlock_fd_resume (void *carg)
ret = nfs_lk (cs->nfsx, cs->vol, &nfu, cs->fd, F_SETLK,
&flock, nlm4svc_unlock_cbk, cs);
+ GF_REF_PUT (cs);
+
return ret;
}
@@ -1724,7 +1742,7 @@ nlm4_unlock_resume (void *carg)
if (!carg)
return ret;
- cs = (nfs3_call_state_t *)carg;
+ cs = GF_REF_GET ((nfs3_call_state_t *)carg);
nlm4_check_fh_resolve_status (cs, stat, nlm4err);
caller_name = cs->args.nlm4_unlockargs.alock.caller_name;
@@ -1754,6 +1772,9 @@ nlm4err:
nfs3_call_state_wipe (cs);
}
+
+ GF_REF_PUT (cs);
+
/* we have already taken care of cleanup */
return 0;
}
@@ -2421,6 +2442,9 @@ nlm_handle_connect (struct rpc_clnt *rpc_clnt, nfs3_call_state_t *cs)
}
out:
+ if (cs)
+ GF_REF_PUT (cs);
+
return ret;
}