git: 85cbda13218d - stable/13 - nfs_clvnops.c: Fix access to v_mount when vnode unlocked

The branch stable/13 has been updated by rmacklem:

URL: https://cgit.FreeBSD.org/src/commit/?id=85cbda13218d951f2862f63dbf2652a201cd024b

commit 85cbda13218d951f2862f63dbf2652a201cd024b
Author:     Rick Macklem <rmacklem@FreeBSD.org>
AuthorDate: 2022-10-01 14:43:53 +0000
Commit:     Rick Macklem <rmacklem@FreeBSD.org>
CommitDate: 2022-10-15 01:01:58 +0000

    nfs_clvnops.c: Fix access to v_mount when vnode unlocked
    
    Commit ab17854f974b fixed access to v_mount when the
    vnode is unlocked for nfs_copy_file_range().
    
    This patch does the same for nfs_ioctl().
    
    (cherry picked from commit bffb3d947b2ee48dc30c4876e0c7a5927375e38f)
---
 sys/fs/nfsclient/nfs_clvnops.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/sys/fs/nfsclient/nfs_clvnops.c b/sys/fs/nfsclient/nfs_clvnops.c
index 4edfee540cc9..02e5e3540d72 100644
--- a/sys/fs/nfsclient/nfs_clvnops.c
+++ b/sys/fs/nfsclient/nfs_clvnops.c
@@ -4026,14 +4026,6 @@ nfs_ioctl(struct vop_ioctl_args *ap)
 	int attrflag, content, error, ret;
 	bool eof = false;			/* shut up compiler. */
 
-	if (vp->v_type != VREG)
-		return (ENOTTY);
-	nmp = VFSTONFS(vp->v_mount);
-	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
-		error = vop_stdioctl(ap);
-		return (error);
-	}
-
 	/* Do the actual NFSv4.2 RPC. */
 	switch (ap->a_command) {
 	case FIOSEEKDATA:
@@ -4049,6 +4041,18 @@ nfs_ioctl(struct vop_ioctl_args *ap)
 	error = vn_lock(vp, LK_SHARED);
 	if (error != 0)
 		return (EBADF);
+
+	if (vp->v_type != VREG) {
+		VOP_UNLOCK(vp);
+		return (ENOTTY);
+	}
+	nmp = VFSTONFS(vp->v_mount);
+	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
+		VOP_UNLOCK(vp);
+		error = vop_stdioctl(ap);
+		return (error);
+	}
+
 	attrflag = 0;
 	if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
 		error = ENXIO;