From: Sunil Khatri <sunil.khatri@amd.com>
Date: Tue, 21 Oct 2025 09:44:06 +0000 (+0530)
Subject: drm/amdgpu: null check for hmm_pfns ptr before freeing it
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=84564d2920b8c858d96cb7471b45203d35f63b61;p=thirdparty%2Fkernel%2Flinux.git

drm/amdgpu: null check for hmm_pfns ptr before freeing it

Due to low memory or when num of pages is too big to be
accomodated, allocation could fail for pfn's.

Chekc hmm_pfns for NULL before calling the kvfree for the it.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Acked-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
index d6f903a2d573a..7e5a09b0bc783 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
@@ -286,7 +286,9 @@ void amdgpu_hmm_range_free(struct amdgpu_hmm_range *range)
 	if (!range)
 		return;
 
-	kvfree(range->hmm_range.hmm_pfns);
+	if (range->hmm_range.hmm_pfns)
+		kvfree(range->hmm_range.hmm_pfns);
+
 	amdgpu_bo_unref(&range->bo);
 	kfree(range);
 }