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 ECA8D27F749; Wed, 4 Feb 2026 14:54:32 +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=1770216873; cv=none; b=qx+V9sNhoaz28Ku2xYM+8SpfMLHNX9Wuy8Inz2pe12c349PfCTMsE6b1D0d9o56HGsLSh7dfW88sRdJahKJR8HJ/XIxuuXSU+Lyz/AW4lzPXPahZAI4GJdg/xfCaG+l0bFic7j8OQ47whUQA0VDFnj4+5NzbYjk2SPrlzA5nlcI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216873; c=relaxed/simple; bh=lPVBDfc+C4XIIiDKdu+mtGq2aTEtUsPtJbAcNGoLtZI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ws0A92iIO7yR1qoGwjkk8fp8ZekQLurBpIv8vGFSYJkUI+0JRdtb5uCTEms2dTWpFo9J5wYB65LwbWs8sq77QcKpx7IgFt3IfncDm6rkKlpln06IMMRVYchKJQIzmIL9HVqaYeRnzpOuouGEf1r3f7ISKaKrk3xhjenQ7tCDmN4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1L0rSHte; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="1L0rSHte" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A635C4CEF7; Wed, 4 Feb 2026 14:54:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1770216872; bh=lPVBDfc+C4XIIiDKdu+mtGq2aTEtUsPtJbAcNGoLtZI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1L0rSHtepNhLKwSpe9TNXGS9C24Z9ttkPSSrjt7t4xyRiGNTkkebvsnT279YMO685 a+dhofK71kyjNc/Nqev/89wdL8VfeXbReJopDOVxQgOEjaWO52cBIEO3pYmS4nrC5I ULj/w+WKjyL03S1Y+KRYOVMSfG9aO6AAwQ3Kjg2o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jaroslav Kysela , Takashi Iwai Subject: [PATCH 5.15 023/206] ALSA: pcm: Improve the fix for race of buffer access at PCM OSS layer Date: Wed, 4 Feb 2026 15:37:34 +0100 Message-ID: <20260204143859.038344725@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260204143858.193781818@linuxfoundation.org> References: <20260204143858.193781818@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jaroslav Kysela commit 47c27c9c9c720bc93fdc69605d0ecd9382e99047 upstream. Handle the error code from snd_pcm_buffer_access_lock() in snd_pcm_runtime_buffer_set_silence() function. Found by Alexandros Panagiotou Fixes: 93a81ca06577 ("ALSA: pcm: Fix race of buffer access at PCM OSS layer") Cc: stable@vger.kernel.org # 6.15 Signed-off-by: Jaroslav Kysela Link: https://patch.msgid.link/20260107213642.332954-1-perex@perex.cz Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- include/sound/pcm.h | 2 +- sound/core/oss/pcm_oss.c | 4 +++- sound/core/pcm_native.c | 9 +++++++-- 3 files changed, 11 insertions(+), 4 deletions(-) --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -1384,7 +1384,7 @@ int snd_pcm_lib_mmap_iomem(struct snd_pc #define snd_pcm_lib_mmap_iomem NULL #endif -void snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime); +int snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime); /** * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer --- a/sound/core/oss/pcm_oss.c +++ b/sound/core/oss/pcm_oss.c @@ -1079,7 +1079,9 @@ static int snd_pcm_oss_change_params_loc runtime->oss.params = 0; runtime->oss.prepare = 1; runtime->oss.buffer_used = 0; - snd_pcm_runtime_buffer_set_silence(runtime); + err = snd_pcm_runtime_buffer_set_silence(runtime); + if (err < 0) + goto failure; runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size); --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -705,13 +705,18 @@ static void snd_pcm_buffer_access_unlock } /* fill the PCM buffer with the current silence format; called from pcm_oss.c */ -void snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime) +int snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime) { - snd_pcm_buffer_access_lock(runtime); + int err; + + err = snd_pcm_buffer_access_lock(runtime); + if (err < 0) + return err; if (runtime->dma_area) snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes)); snd_pcm_buffer_access_unlock(runtime); + return 0; } EXPORT_SYMBOL_GPL(snd_pcm_runtime_buffer_set_silence);