From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BF2EE3803D9 for ; Mon, 27 Apr 2026 07:40:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777275619; cv=none; b=OGbJZ1YrYfefqbrgek8ihzp35wJa50QZwx3UXJP8VCZi53AyTw/MYv4pwnpc6bd0c+4iKeKzQl92Th6nw3zSaKLgyS0HwkVZ5sS5udrjpGB8SdoU5pYDmYi1j2QC7sVcL4TBrQX6sdYhrknxjvfwiAE/z0387WhtH0LtNgwkABs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777275619; c=relaxed/simple; bh=pG3a1wD6QbXZb19qgYGezMebt+EVac5librIV2OsXv8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ZGysQeFSD5qrMJwmes3HwFRkjwAWeDZmVibhzUpJ0U7t+NWO03s5nVMORK9+03LEnHWw8K+dKKBID+NWJkqq99/cjRxziAs4G+by7PuPkp3gTl7R1saomi+E/PNTOEjOpgM6XmuKEh6XgZf6Ft+NVN88eXsu/1kA6Cei+M7DnDQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TSv0yBPo; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TSv0yBPo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5AB9C2BCB4; Mon, 27 Apr 2026 07:40:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777275619; bh=pG3a1wD6QbXZb19qgYGezMebt+EVac5librIV2OsXv8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TSv0yBPo83UGutbDwPJla0iJORrQ7S7eLiMpGjMX+Jw/Jj99RdLVdVdrrV/rT2H9I HYCC/UyQq2dyQPC1nlNfnZ8HczlxlyC/d8ARIYSdQq0V0vqrMxaOflEnLz+PCB1DIy lzg+op2c3jzHt8GM3ft6822PNG6XKYop8sTwdKkPjeTR8OJUEipIaVn9O6zMIK9qr4 GZ4IuFzx5ORdBk8yGQ+rsVZMX6LuTnwNWAJrjGKj04Xfii+lf5fbGvU0WY/2e4+dRW 3iU6YXFU/yvgda1/RYHznY8/nvOfMFVE3gqHIbztzGN3YZtGG2XsDqqFSzJ3LFAMJo 8+avALql1xBJw== Message-ID: Date: Mon, 27 Apr 2026 09:40:12 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page To: Sunny Patel , Andrew Morton Cc: Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260427063729.17294-1-nueralspacetech@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/27/26 08:37, Sunny Patel wrote: > When migrate_vma_insert_huge_pmd_page() jumps to unlock_abort due > to a PMD check failure, the pgtable allocated earlier via > pte_alloc_one() is never freed, causing a memory leak. > > Add a pte_free() call in the unlock_abort error path to release > the pgtable before returning.Also included before goto abort in the > folio check path. > > Signed-off-by: Sunny Patel > --- Fixes: a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone device pages") Cc: Sashiko moans about a lot of unrelated stuff, one of them fixed by your other fix, and one of them to be cleaned up by your other patch. There is another thing about migrate_vma_split_folio() and temporary split_folio() failures which I think we can ignore. Acked-by: David Hildenbrand (Arm) -- Cheers, David