Author: rmacklem
Date: Fri Aug 25 22:44:55 2017
New Revision: 322908
URL: https://svnweb.freebsd.org/changeset/base/322908
Log:
MFC: r321675
Fix possible crash for the NFSv4.1 pNFS client.
If the nfsrpc_createlayoutrpc() call in nfsrpc_getcreatelayout() fails,
the code used nfhpp when it might be set NULL. This patch checks for
the error cases (laystat != 0) and avoids using nfhpp for the failure case.
This would only affect NFSv4.1 mounts with the "pnfs" option.
Found while testing the "umount -N" patch not yet in head.
Modified:
stable/11/sys/fs/nfsclient/nfs_clrpcops.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/fs/nfsclient/nfs_clrpcops.c
==============================================================================
--- stable/11/sys/fs/nfsclient/nfs_clrpcops.c Fri Aug 25 22:39:49 2017
(r322907)
+++ stable/11/sys/fs/nfsclient/nfs_clrpcops.c Fri Aug 25 22:44:55 2017
(r322908)
@@ -6633,9 +6633,14 @@ nfsrpc_getcreatelayout(vnode_t dvp, char *name, int na
NFSCL_DEBUG(4, "aft nfsrpc_createlayoutrpc laystat=%d err=%d\n",
laystat, error);
lyp = NULL;
- nfhp = *nfhpp;
- laystat = nfsrpc_layoutgetres(nmp, dvp, nfhp->nfh_fh, nfhp->nfh_len,
- &stateid, retonclose, NULL, &lyp, &flh, laystat, NULL, cred, p);
+ if (laystat == 0) {
+ nfhp = *nfhpp;
+ laystat = nfsrpc_layoutgetres(nmp, dvp, nfhp->nfh_fh,
+ nfhp->nfh_len, &stateid, retonclose, NULL, &lyp, &flh,
+ laystat, NULL, cred, p);
+ } else
+ laystat = nfsrpc_layoutgetres(nmp, dvp, NULL, 0, &stateid,
+ retonclose, NULL, &lyp, &flh, laystat, NULL, cred, p);
if (laystat == 0)
nfscl_rellayout(lyp, 0);
return (error);
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