From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19E2EC433EF for ; Tue, 7 Jun 2022 20:59:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377427AbiFGU7h (ORCPT ); Tue, 7 Jun 2022 16:59:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356533AbiFGTx0 (ORCPT ); Tue, 7 Jun 2022 15:53:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A2B64D632; Tue, 7 Jun 2022 11:23:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4A4716127C; Tue, 7 Jun 2022 18:23:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57D7CC385A5; Tue, 7 Jun 2022 18:23:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654626196; bh=+hczqrVV9QRUroM1CK7I7IRBPGHFmeEUds3FThURv7A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qtZawPJUPfCcWLB2Fu/jlRpf26PXuiqFASeuRcGI1tcsMUQgX11CD7hsCdf33M88w e6i2pZS55KfJTijKzATy6Cf/5bjA/fKHK6IfqQR7lUZqiDJ9T0u7b4Pezi3Z5Uv5JZ zIAkmZAfUmTDwCds+fHLG3wQHfvftXK9QOkIb1ms= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Takashi Iwai , Sasha Levin Subject: [PATCH 5.17 290/772] ALSA: pcm: Check for null pointer of pointer substream before dereferencing it Date: Tue, 7 Jun 2022 18:58:02 +0200 Message-Id: <20220607164957.570471703@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164948.980838585@linuxfoundation.org> References: <20220607164948.980838585@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King [ Upstream commit 011b559be832194f992f73d6c0d5485f5925a10b ] Pointer substream is being dereferenced on the assignment of pointer card before substream is being null checked with the macro PCM_RUNTIME_CHECK. Although PCM_RUNTIME_CHECK calls BUG_ON, it still is useful to perform the the pointer check before card is assigned. Fixes: d4cfb30fce03 ("ALSA: pcm: Set per-card upper limit of PCM buffer allocations") Signed-off-by: Colin Ian King Link: https://lore.kernel.org/r/20220424205945.1372247-1-colin.i.king@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/core/pcm_memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index 8848d2f3160d..b8296b6eb2c1 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -453,7 +453,6 @@ EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); */ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) { - struct snd_card *card = substream->pcm->card; struct snd_pcm_runtime *runtime; if (PCM_RUNTIME_CHECK(substream)) @@ -462,6 +461,8 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) if (runtime->dma_area == NULL) return 0; if (runtime->dma_buffer_p != &substream->dma_buffer) { + struct snd_card *card = substream->pcm->card; + /* it's a newly allocated buffer. release it now. */ do_free_pages(card, runtime->dma_buffer_p); kfree(runtime->dma_buffer_p); -- 2.35.1