[PATCH -next] drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to_ram()

[Yang Li]

./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c:985:58-62: ERROR: p is NULL but dereferenced.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2549
Reported-by: Abaci Robot <abaci at linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee at linux.alibaba.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index cddf259875c0..405dd51521dc 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -981,7 +981,8 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
 out_mmput:
 	mmput(mm);
 
-	pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr);
+	if (p)
+		pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr);
 
 	return r ? VM_FAULT_SIGBUS : 0;
 }
-- 
2.20.1.7.g153144c