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 EC207C77B76 for ; Tue, 18 Apr 2023 12:47:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232060AbjDRMr4 (ORCPT ); Tue, 18 Apr 2023 08:47:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232055AbjDRMry (ORCPT ); Tue, 18 Apr 2023 08:47:54 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34A301AD for ; Tue, 18 Apr 2023 05:47:53 -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 C50D862B21 for ; Tue, 18 Apr 2023 12:47:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8E8CC433EF; Tue, 18 Apr 2023 12:47:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681822072; bh=kJYfukdJ863JzUgQwEqwOLn1+LPDE3QziNMDK1i2+rY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T4gORkw/CKKIBR5MUQAUIhlQOzEn18+YuR7yOueqG2CC6qmtgJKT7ChSKHyZjLYUV Tdb9WqaLoEbg1fsN0lpBINvcR//oYphqBNdbEjeSORsIu/f2JBfL2OTrdcw1JK5KqJ 1OhYJhNkQvtoWqozLbLeWTDbLPTSln80M5DIG+kk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Oswald Buddenhagen , Takashi Iwai Subject: [PATCH 6.2 004/139] ALSA: emu10k1: fix capture interrupt handler unlinking Date: Tue, 18 Apr 2023 14:21:09 +0200 Message-Id: <20230418120313.881297841@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120313.725598495@linuxfoundation.org> References: <20230418120313.725598495@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Oswald Buddenhagen commit b09c551c77c7e01dc6e4f3c8bf06b5ffa7b06db5 upstream. Due to two copy/pastos, closing the MIC or EFX capture device would make a running ADC capture hang due to unsetting its interrupt handler. In principle, this would have also allowed dereferencing dangling pointers, but we're actually rather thorough at disabling and flushing the ints. While it may sound like one, this actually wasn't a hypothetical bug: PortAudio will open a capture stream at startup (and close it right away) even if not asked to. If the first device is busy, it will just proceed with the next one ... thus killing a concurrent capture. Signed-off-by: Oswald Buddenhagen Cc: Link: https://lore.kernel.org/r/20230405201220.2197923-1-oswald.buddenhagen@gmx.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/pci/emu10k1/emupcm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/sound/pci/emu10k1/emupcm.c +++ b/sound/pci/emu10k1/emupcm.c @@ -1236,7 +1236,7 @@ static int snd_emu10k1_capture_mic_close { struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream); - emu->capture_interrupt = NULL; + emu->capture_mic_interrupt = NULL; emu->pcm_capture_mic_substream = NULL; return 0; } @@ -1344,7 +1344,7 @@ static int snd_emu10k1_capture_efx_close { struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream); - emu->capture_interrupt = NULL; + emu->capture_efx_interrupt = NULL; emu->pcm_capture_efx_substream = NULL; return 0; }