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 9736538F930; Tue, 16 Jun 2026 17:12:06 +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=1781629927; cv=none; b=KzyBuWg4ouz9LpMg+A+NtNUgyuv9YnynN0JZn7ihraELz4Ue2rGh0tyVk57MQB2wVDMl9IFL/Y1wbP3btfKiHeZxCDvrmBBS32Ke5m9m9Nh+D62aezDbPlv6h6F2OG2a1IfGJP4f7rrZ7WfmTFW0ZMrutpNTKHNyCTPlngljCCE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781629927; c=relaxed/simple; bh=CnjCC5kl1UkKWJ0bDLuZoOAUUTcbCfaRaikJ+KtE94A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GWQjJVQNr08oZ4+UCwceaFkATAHhFJGViOHHkRNAnaKp4WtLd0Mus8KYpLD6xkFBom2J3udSAfCtoWXkMOIroLxpB2Q2Iwi7lCAppwfdQikvosDqgpE9GZloPuo4/9FLi7DYuDD8BoJakWWmFCCFr1q2lk7+AY1KwmzDX7Giekg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LyR3Cev9; 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="LyR3Cev9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78C0A1F000E9; Tue, 16 Jun 2026 17:12:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781629926; bh=jT1pJMkcg7anMKR3emn0jEcoQKvA+dnRpb84nHvkQGc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LyR3Cev9C8fudWYSEKzxL3G4TAgikpIic0ut/wBLICWvLC+XRwEDgYMfGvXqld5Bn ejVEwef9nvC8ycb5gt1ss9SP6BSeRAxAAOocFgzsz8QLkv6f1SvzXtiijKl+qSnKBJ qG/eG5fgUMFW7xx0i8t6Ew1TVJXOgS5UT0O1jg0M= 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 6.6 335/452] misc: fastrpc: fix DMA address corruption due to find_vma misuse Date: Tue, 16 Jun 2026 20:29:22 +0530 Message-ID: <20260616145134.939639169@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145117.796205997@linuxfoundation.org> References: <20260616145117.796205997@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 6.6-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 @@ -1057,7 +1057,7 @@ 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;