Commit f546be6a19d2 for kernel

commit f546be6a19d24d02be576d8617cb26c7acb61594
Author: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Date:   Thu May 7 15:44:37 2026 +0000

    mshv: Fix missing error code on VP allocation failure

    In mshv_partition_ioctl_create_vp(), when kzalloc for the VP struct
    fails, the code jumps to the cleanup path without setting ret. At that
    point ret is 0 from the preceding successful mshv_vp_stats_map() call,
    so the function returns success to userspace despite having failed to
    create the VP. No fd is installed and no VP is registered in pt_vp_array,
    but userspace has no way to know the operation failed.

    Set ret to -ENOMEM before jumping to the cleanup path.

    Fixes: 621191d709b14 ("Drivers: hv: Introduce mshv_root module to expose /dev/mshv to VMMs")
    Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
    Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
    Signed-off-by: Wei Liu <wei.liu@kernel.org>

diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c
index 146726cc4e9b..644f9b10cbba 100644
--- a/drivers/hv/mshv_root_main.c
+++ b/drivers/hv/mshv_root_main.c
@@ -1117,8 +1117,10 @@ mshv_partition_ioctl_create_vp(struct mshv_partition *partition,
 		goto unmap_ghcb_page;

 	vp = kzalloc_obj(*vp);
-	if (!vp)
+	if (!vp) {
+		ret = -ENOMEM;
 		goto unmap_stats_pages;
+	}

 	vp->vp_partition = mshv_partition_get(partition);
 	if (!vp->vp_partition) {