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 64C5C269817; Mon, 7 Apr 2025 18:15:13 +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=1744049713; cv=none; b=kH+yymOjw07T9feFVskUZs1oVvQS5MDsvgU39YRiwjIBv815PTDP1qJBK2x2tSa4B94nMIAgeWko/M2XsU0X2nP3piG2zk/FZOcYrLH2O17+kDrbaezXOi9Lq2XrmOuRRapzumRfCFDDTPbCg7piwqQ6x5erczfzClqDYlZJYhY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744049713; c=relaxed/simple; bh=QNsoeK8DnciAtuDtVld6p1u5T3ejqruwhCx/D5HmAkc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Uttr/r1SO0Rg5cXRK1HbrK/j1mvKJXflx6T+r8wCUF/3b0V1OZXe7swUbAEPaFf8DtxJ8rsZGs3ralKJM81t0cibmXTOSAk7uD4stRPH2rlNPxGuafwZBx6yDhds72I0EXlFLHxOBgNrcmcQKZ0xcf1R88GSOgPgGbyI06FucGI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Xe7fLD4t; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Xe7fLD4t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2CBD4C4CEE9; Mon, 7 Apr 2025 18:15:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744049712; bh=QNsoeK8DnciAtuDtVld6p1u5T3ejqruwhCx/D5HmAkc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xe7fLD4tBC+5nVLwmmW7ue+gQjhfsHHtwWIUwHEUM9OI7pKA5ul2dD2hmKcItIfOF W34XMPEFScjzCwfs+pYkLx3pTx++1opfR1P+Pqkc1xEGN4rlFaZI5SMwu1bRu6gGh1 EzQtxBGweAHQAU70/XQwMLYH6J654qf33GvXLBkeZfpsCUZQyabKxMe2JTv/q+pu9Z 5tmRL7ph3rtj4uOseC0uVcJ8pa+FrfmHRM8Q5mBeRGv5ThB5VVD8qcK7Fj68rD1hxo 4/eJmbs1NE6YhFyJf4ziqAbo5KXxoJy8ofVFAIuxvSwsP8igey9IjLLxLxacGGqLM+ xbftN+mrSa4Ng== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Josh Poimboeuf , kernel test robot , Ingo Molnar , Mark Brown , Srinivas Kandagatla , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Linus Torvalds , Sasha Levin , nathan@kernel.org, linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH AUTOSEL 6.1 12/13] objtool, ASoC: codecs: wcd934x: Remove potential undefined behavior in wcd934x_slim_irq_handler() Date: Mon, 7 Apr 2025 14:14:46 -0400 Message-Id: <20250407181449.3183687-12-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250407181449.3183687-1-sashal@kernel.org> References: <20250407181449.3183687-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.133 Content-Transfer-Encoding: 8bit From: Josh Poimboeuf [ Upstream commit 060aed9c0093b341480770457093449771cf1496 ] If 'port_id' is negative, the shift counts in wcd934x_slim_irq_handler() also become negative, resulting in undefined behavior due to shift out of bounds. If I'm reading the code correctly, that appears to be not possible, but with KCOV enabled, Clang's range analysis isn't always able to determine that and generates undefined behavior. As a result the code generation isn't optimal, and undefined behavior should be avoided regardless. Improve code generation and remove the undefined behavior by converting the signed variables to unsigned. Fixes the following warning with UBSAN: sound/soc/codecs/snd-soc-wcd934x.o: warning: objtool: .text.wcd934x_slim_irq_handler: unexpected end of section Reported-by: kernel test robot Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Acked-by: Mark Brown Cc: Srinivas Kandagatla Cc: Liam Girdwood Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Linus Torvalds Link: https://lore.kernel.org/r/7e863839ec7301bf9c0f429a03873d44e484c31c.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503180044.oH9gyPeg-lkp@intel.com/ Signed-off-by: Sasha Levin --- sound/soc/codecs/wcd934x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c index 0b5999c819db9..04c50f9acda18 100644 --- a/sound/soc/codecs/wcd934x.c +++ b/sound/soc/codecs/wcd934x.c @@ -2281,7 +2281,7 @@ static irqreturn_t wcd934x_slim_irq_handler(int irq, void *data) { struct wcd934x_codec *wcd = data; unsigned long status = 0; - int i, j, port_id; + unsigned int i, j, port_id; unsigned int val, int_val = 0; irqreturn_t ret = IRQ_NONE; bool tx; -- 2.39.5