[PATCH] mm/migrate_device: fix spinlock leak in migrate_vma_insert_huge_pmd_page

[Sunny Patel]

When check_stable_address_space() fails after the PMD spinlock has
been acquired via pmd_lock(), the code jumps directly to the abort
label, bypassing the spin_unlock() call in unlock_abort. This causes
the PMD spinlock to be permanently held, leading to a deadlock.

Change the goto target from abort to unlock_abort to ensure the
spinlock is always released on this error path.

Signed-off-by: Sunny Patel <nueralspacetech@xxxxxxxxx>
---
 mm/migrate_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index fbfe5715f635..ab49d4dcdb60 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -850,7 +850,7 @@ static int migrate_vma_insert_huge_pmd_page(struct migrate_vma *migrate,
 	ptl = pmd_lock(vma->vm_mm, pmdp);
 	csa_ret = check_stable_address_space(vma->vm_mm);
 	if (csa_ret)
-		goto abort;
+		goto unlock_abort;
 
 	/*
 	 * Check for userfaultfd but do not deliver the fault. Instead,
-- 
2.43.0