From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 931843C65F2; Tue, 16 Jun 2026 17:47:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781632047; cv=none; b=jCvba3FSyFXwD2BQ3fqrNoj5Q4DGbv2DsSlaTlb+lUaMRnCJfHL7N1EQficq0VDlgYDUoaUMRcBIr7BBimE8/UBpVnLgeoQT4mqm57MWBEwhtW+HjmHM2a5ROj120ynRnWpt/DVAdQAGV8l3z9lk4J7Dxfol+fptGphE9j8M8ow= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781632047; c=relaxed/simple; bh=eB0j97HsykKXEVeKMQo/G9C9irygeyP7Wi6/UV8tvg4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IOtIDfIpF4BkpNB5tU/N0TRdErNKNcvEs8PbjUzVi2nTDUXcFGdh6T0D7bgqKpzYU1Kq5JMMEq5zHFAD2+ygR007LR2kmq8PQxfzJN512MSx/DT/ic0XZmhe9SLKT7YBeS+6c/cY7j1F013TPajv5wFjiECSWkL1NGZkTCtwcN8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=h0Apaaz3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="h0Apaaz3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F32B1F000E9; Tue, 16 Jun 2026 17:47:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781632046; bh=VbhUrvk3212T2wP184Rk0iSC6UOpjJSq5n0VFrkc0WQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=h0Apaaz3LXxKRJyqTSpJoM7inbxO8isVda1SdebUaTVDbGm0sE8fVF/of5iOaP8ma CeJU5ZwyminMDgz7C7aCQ6K4dRO7TGXlAIwxXNocTaziPKK8U/SeMuYf4WjkKdmsed 5SKfAanXrzEoGpypnVXv29ZHUtX/o3RQbHhliino= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , Dmitry Baryshkov , Srinivas Kandagatla Subject: [PATCH 6.1 303/522] misc: fastrpc: fix DMA address corruption due to find_vma misuse Date: Tue, 16 Jun 2026 20:27:30 +0530 Message-ID: <20260616145140.066954232@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145125.307082728@linuxfoundation.org> References: <20260616145125.307082728@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo commit 464c6ad2aa16e1e1df9d559289199356493d1e00 upstream. fastrpc_get_args() uses find_vma() to look up the VMA for a user-provided pointer and compute a DMA address offset. When the address falls in a gap before the returned VMA, (ptr & PAGE_MASK) - vma->vm_start underflows, corrupting the DMA address sent to the DSP. Replace find_vma() with vma_lookup(), which returns NULL when the address is not contained within any VMA. Cc: stable@vger.kernel.org Fixes: 80f3afd72bd4 ("misc: fastrpc: consider address offset before sending to DSP") Reported-by: Yuhao Jiang Signed-off-by: Junrui Luo Reviewed-by: Dmitry Baryshkov Signed-off-by: Srinivas Kandagatla Link: https://patch.msgid.link/20260530204528.116920-3-srini@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/misc/fastrpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -994,7 +994,7 @@ static int fastrpc_get_args(u32 kernel, pages[i].addr = ctx->maps[i]->phys; mmap_read_lock(current->mm); - vma = find_vma(current->mm, ctx->args[i].ptr); + vma = vma_lookup(current->mm, ctx->args[i].ptr); if (vma) pages[i].addr += (ctx->args[i].ptr & PAGE_MASK) - vma->vm_start;