git: c4469e134e04 - stable/13 - vmm devmem_mmap_single: Bump object reference under memsegs lock.

The branch stable/13 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=c4469e134e0479c03aedc3bf4e85221f29b1c26b

commit c4469e134e0479c03aedc3bf4e85221f29b1c26b
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2022-11-18 18:04:58 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2023-01-26 22:05:46 +0000

    vmm devmem_mmap_single: Bump object reference under memsegs lock.
    
    Reported by:    markj
    Reviewed by:    corvink, markj
    Differential Revision:  https://reviews.freebsd.org/D37273
    
    (cherry picked from commit 223de44c93659457e05036dec25b0af610a773a6)
---
 sys/amd64/vmm/vmm_dev.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/sys/amd64/vmm/vmm_dev.c b/sys/amd64/vmm/vmm_dev.c
index 571e287dc4b6..90b0b6b45f26 100644
--- a/sys/amd64/vmm/vmm_dev.c
+++ b/sys/amd64/vmm/vmm_dev.c
@@ -1262,15 +1262,13 @@ devmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t len,
 	KASSERT(error == 0 && !sysmem && *objp != NULL,
 	    ("%s: invalid devmem segment %d", __func__, dsc->segid));
 
+	if (seglen >= last)
+		vm_object_reference(*objp);
+	else
+		error = EINVAL;
 
 	vm_unlock_memsegs(dsc->sc->vm);
-
-	if (seglen >= last) {
-		vm_object_reference(*objp);
-		return (0);
-	} else {
-		return (EINVAL);
-	}
+	return (error);
 }
 
 static struct cdevsw devmemsw = {