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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1773056617; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=E6ni+V15gEXaXXBvNzq+0rhu2ZSMmb0xp9G3k1TvHqc=; b=jXElw1ySaZIGt0aOj4NcaVRPGdTR+68a8jfgKGMZjOR/3sUe4ETq+t/RN2Ngm1MrwhJ9BR HxSCqmgoVVJNQFCZ2Mz8nJb9TfWmngGIS3/rks5ZAMPn0YVjhQFTLHX4BxSsjpq2Gg4451 LviTw7z0nNdzIKgAcSr1+eHqB0i7HrU= From: Thorsten Blum To: Johannes Berg , Jaroslav Kysela , Takashi Iwai , Kees Cook Cc: Thorsten Blum , stable@vger.kernel.org, Takashi Iwai , linuxppc-dev@lists.ozlabs.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ALSA: aoa: Handle empty codec list in i2sbus_pcm_prepare() Date: Mon, 9 Mar 2026 12:41:59 +0100 Message-ID: <20260309114159.765304-3-thorsten.blum@linux.dev> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2247; i=thorsten.blum@linux.dev; h=from:subject; bh=RlF+xgJCNuvzFdIDPLMyD53b705fRJwJDPrTPtFEut8=; b=owGbwMvMwCUWt7pQ4caZUj3G02pJDJnrNrHvXpf5KdbN7HPRj+gmq51nTr44wue80Tl3Q4/S9 0cSiyd6dpSyMIhxMciKKbI8mPVjhm9pTeUmk4idMHNYmUCGMHBxCsBELqUw/Hf9Guiac7dYUzIl kXU+S/nnj5a17zMviF9b6dsWmJPfOofhf7mjQ27dwVCvR1+Zf2kqMO2reP1t/cQzeyOdulc2vCh dzg0A X-Developer-Key: i=thorsten.blum@linux.dev; a=openpgp; fpr=1D60735E8AEF3BE473B69D84733678FD8DFEEAD4 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Replace two list_for_each_entry() loops with list_first_entry_or_null() in i2sbus_pcm_prepare(). Handle an empty codec list explicitly by returning -ENODEV, which avoids using uninitialized 'bi.sysclock_factor' in the 32-bit code path. Fixes: f3d9478b2ce4 ("[ALSA] snd-aoa: add snd-aoa") Cc: stable@vger.kernel.org Signed-off-by: Thorsten Blum --- sound/aoa/soundbus/i2sbus/pcm.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/sound/aoa/soundbus/i2sbus/pcm.c b/sound/aoa/soundbus/i2sbus/pcm.c index aff99003d833..65653601662d 100644 --- a/sound/aoa/soundbus/i2sbus/pcm.c +++ b/sound/aoa/soundbus/i2sbus/pcm.c @@ -314,7 +314,7 @@ static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in) int i, periodsize, nperiods; dma_addr_t offset; struct bus_info bi; - struct codec_info_item *cii; + struct codec_info_item *cii = NULL; int sfr = 0; /* serial format register */ int dws = 0; /* data word sizes reg */ int input_16bit; @@ -390,13 +390,11 @@ static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in) case SNDRV_PCM_FORMAT_U16_BE: /* FIXME: if we add different bus factors we need to * do more here!! */ - bi.bus_factor = 0; - list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { - bi.bus_factor = cii->codec->bus_factor; - break; - } - if (!bi.bus_factor) + cii = list_first_entry_or_null(&i2sdev->sound.codec_list, + struct codec_info_item, list); + if (!cii) return -ENODEV; + bi.bus_factor = cii->codec->bus_factor; input_16bit = 1; break; case SNDRV_PCM_FORMAT_S32_BE: @@ -410,10 +408,12 @@ static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in) return -EINVAL; } /* we assume all sysclocks are the same! */ - list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { - bi.sysclock_factor = cii->codec->sysclock_factor; - break; - } + if (!cii) + cii = list_first_entry_or_null(&i2sdev->sound.codec_list, + struct codec_info_item, list); + if (!cii) + return -ENODEV; + bi.sysclock_factor = cii->codec->sysclock_factor; if (clock_and_divisors(bi.sysclock_factor, bi.bus_factor,