linux-kernel - [PATCH -next] drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to

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Message-Id: <20221025072822.129940-1-yang.lee@linux.alibaba.com>
Date:   Tue, 25 Oct 2022 15:28:22 +0800
From:   Yang Li <yang.lee@...ux.alibaba.com>
To:     alexander.deucher@....com
Cc:     Felix.Kuehling@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Yang Li <yang.lee@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: [PATCH -next] drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to_ram()

./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@...ux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@...ux.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