git: a9dcfac2fd6a - stable/12 - OpenZFS: Ensure that zfs_getattr() initializes the va_rdev field

The branch stable/12 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=a9dcfac2fd6a26671b707d15727935ed24c681b5

commit a9dcfac2fd6a26671b707d15727935ed24c681b5
Author:     Mark Johnston <markjdb@gmail.com>
AuthorDate: 2023-12-07 16:20:11 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2023-12-10 17:48:51 +0000

    OpenZFS: Ensure that zfs_getattr() initializes the va_rdev field
    
    Otherwise the field is left uninitialized, leading to a possible kernel
    memory disclosure to userspace or to the network.  Use the same
    initialization value we use in zfsctl_common_getattr().
    
    Reported-by: KMSAN
    Sponsored-by: The FreeBSD Foundation
    Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Reviewed-by: Ed Maste <emaste@FreeBSD.org>
    Signed-off-by: Mark Johnston <markj@FreeBSD.org>
    
    (cherry picked from commit 11656234b560c401dec6a16e1bf048b20fd31aac)
    (cherry picked from commit af1e8b52d26502bac9a2484b87d1879334debd67)
    
    Differential Revision:  https://reviews.freebsd.org/D42987
---
 sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
index c61714bb358a..34f3476c2064 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
@@ -2735,6 +2735,8 @@ zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
 #else
 	if (vp->v_type == VBLK || vp->v_type == VCHR)
 		vap->va_rdev = zfs_cmpldev(rdev);
+	else
+		vap->va_rdev = 0;
 #endif
 	vap->va_seq = zp->z_seq;
 	vap->va_flags = 0;	/* FreeBSD: Reset chflags(2) flags. */