The branch main has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=7a9bc8a82ec20f9208643f1615ea4ca1d0e5d933

commit 7a9bc8a82ec20f9208643f1615ea4ca1d0e5d933
Author:     Mark Johnston <ma...@freebsd.org>
AuthorDate: 2021-07-16 02:39:27 +0000
Commit:     Mark Johnston <ma...@freebsd.org>
CommitDate: 2021-07-16 02:41:10 +0000

    nfssvc: Zero the buffer copied out when NFSSVC_DUMPMNTOPTS is set
    
    Reported by:    KMSAN
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
---
 sys/fs/nfsclient/nfs_clport.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/fs/nfsclient/nfs_clport.c b/sys/fs/nfsclient/nfs_clport.c
index 90d403334155..5c79e3ac6960 100644
--- a/sys/fs/nfsclient/nfs_clport.c
+++ b/sys/fs/nfsclient/nfs_clport.c
@@ -1312,7 +1312,8 @@ nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
                        error = EINVAL;
                }
                if (error == 0) {
-                       buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK);
+                       buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK |
+                           M_ZERO);
                        nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
                            dumpmntopts.ndmnt_blen);
                        vput(nd.ni_vp);
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