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 E96B83E0C67; Mon, 10 Aug 2026 13:04:38 +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=1786367079; cv=none; b=Dt/qun0KGoDs5UXSRGS2JanIaUyb1pAmOrk4UwWyRiCz0u3kwFW5nXIym29yozm5nigxuFiDfBJJEnzE6R0uTXLERjo4dKZJvDUq3R4/lZ5spMn03clP3y+YBDaEQ8TpsJ7Tip+XeDC97bYrHtTEBjEVc5/rNJEs2tbIooZJ5dg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786367079; c=relaxed/simple; bh=lQ97HBSAYhAOD4IPcZzjORKwbgRckHRjegeZhwOb/TQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XkWZ6R1WHoj7qDvOf4s9s517mdAI8tEI4EDqOYtcPEZMYCoa7jSvS7rcF7137B76YGr+K1W9dsaqPfpTUkszqwBblCQdFYX9nHVly0YIU9vv5hat088YUkblsqOtnBZeRXW5WmykWhPpngT/89N2l4ZQ1wnVTJy7oKspGNzXcxE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ARfcyZJS; 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="ARfcyZJS" Received: by smtp.kernel.org (Postfix) with ESMTPS id 36803C2BCF4; Mon, 10 Aug 2026 13:04:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786367078; bh=lQ97HBSAYhAOD4IPcZzjORKwbgRckHRjegeZhwOb/TQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=ARfcyZJS6lHuXvwUBl/sclQfm3+i8S3LHR/jVeLMcL8oppsB/X3QotkvKxzvgy99D vn+P2hMkl8EBm6rtVyDx+oJbU1X7oACbwtu/Vzy/aPSNSfnt5mECXnCVW2GFgUF0jp C0uleKYURgK7WgkfxAvDVW18dmfKMPxS/HIyTLXaeJujRQfng40WCSvJRctP7JlL2s 6kKcHXUaeVg668jUfaPecbGJC+XmYCVkch7wzVW4ifXfZ1cdlvMhcDqkL+mD35WPGc WAwbio+ui8EgPiKFBZclegtvc2LGyJEIJMSpIuViPKn1Io3pJPcreMygVk5/IfL17d qN9jpRihnwe4Q== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 165F3C5AD55; Mon, 10 Aug 2026 13:04:38 +0000 (UTC) From: Miao Wang via B4 Relay Date: Mon, 10 Aug 2026 21:04:24 +0800 Subject: [PATCH RFC v8 1/8] mfd: ls2kbmc: Make a copy when parsing mode string Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260810-ls2kbmc-mod-v8-1-16e44f7322f4@gmail.com> References: <20260810-ls2kbmc-mod-v8-0-16e44f7322f4@gmail.com> In-Reply-To: <20260810-ls2kbmc-mod-v8-0-16e44f7322f4@gmail.com> To: Binbin Zhou , Chong Qiao , Lee Jones , Huacai Chen , Corey Minyard , Linus Walleij , Bartosz Golaszewski Cc: Xi Ruoyao , WANG Xuerui , Yinbo Zhu , Jiaxun Yang , mfd@lists.linux.dev, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, openipmi-developer@lists.sourceforge.net, Miao Wang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2931; i=shankerwangmiao@gmail.com; s=20250715; h=from:subject:message-id; bh=JAJhKtMfhB8SZK77fsh9uMLhohDQu5vL9aOCwD3CkNk=; b=owEBbQKS/ZANAwAKAbAx48p7/tluAcsmYgBqecxj9QIdpLWoE9Z9Dsl9hN35hVCY/OI7XaOBM 2+8En4V4LSJAjMEAAEKAB0WIQREqPWPgPJBxluezBOwMePKe/7ZbgUCannMYwAKCRCwMePKe/7Z btUPD/4/VDwT7IGvUEmL8w5a403ijm8OAp+jZgirdP6TSJ9AYOH5Zap4sF3K4wZvmgAijkbqLIs xQwDE8amSiVdiB0XiSm+/5rlTPT14zGPL7TSUt6inJ3wqbnKsUXq0O8bzFcGJ5wowxHFKmPf1Jj WbWMVfntMv0NIiIVHjvjNW9A5hesIvo3zOBi2TfAOEXyxWBNZPIMknclwgbu9+TXysOZKcHo1Nr ukbBSO7W34WLg9E9Ny8ZzyW1xaIdc9yzzzEs7yx4XyVdonM34x9rom2K9DfzpCDclGU30cVeP6n DpgLcue5UVQ4LUqjiksAnR8dJ2haFAqQDtxUxv4O0AUI7dZxBe0b9RnxR4jjS1htaV+O1nlUFzm 5oOEzTcHJXfpOUObXuQaZOcCRLCLbQCOmXOZzX+KCfFZqRr9Gd2ELM5jk3lUYxG9ea8UC9TbisR AylDGkA+SHVaFJzn7/cJAPoKCrryOMwQPtWzTJKDcyuaOdfbFcnXuo3jS7XnJd03kuvPAl3SAoL bUSx2dUpZg/50NyU1GrDEa1mK3XGKyqsj0qLfTbBsFRsdCTTKz3V+obdHpzPSq+Fen7P0/ptNYe NjLs7uQBBJgq4NcwUJdZ6UM2He33D9zn7NGkf0T5+BnyLFG6UqvQS7hkjdoSoCkVo8zbW4iZPFk FgBnAFmFMpZVVyA== X-Developer-Key: i=shankerwangmiao@gmail.com; a=openpgp; fpr=6FAEFF06B7D212A774C60BFDFA0D166D6632EF4A X-Endpoint-Received: by B4 Relay for shankerwangmiao@gmail.com/20250715 with auth_id=462 X-Original-From: Miao Wang Reply-To: shankerwangmiao@gmail.com From: Miao Wang When parsing the mode string from BMC, the string is manipulated in-place with strsep(), preventing from parsing it again. Make a copy of the original string and manipulate the copy instead to fix this. Fixes: 0d64f6d1ffe9 ("mfd: ls2kbmc: Introduce Loongson-2K BMC core driver") Signed-off-by: Miao Wang --- drivers/mfd/ls2k-bmc-core.c | 51 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 42 insertions(+), 9 deletions(-) diff --git a/drivers/mfd/ls2k-bmc-core.c b/drivers/mfd/ls2k-bmc-core.c index 408056bfb2fe757a5bde43775a483a48352e706d..335590392240ba1e13a2bdf6f9f4efddec045f40 100644 --- a/drivers/mfd/ls2k-bmc-core.c +++ b/drivers/mfd/ls2k-bmc-core.c @@ -427,34 +427,67 @@ static int ls2k_bmc_init(struct ls2k_bmc_ddata *ddata) */ static int ls2k_bmc_parse_mode(struct pci_dev *pdev, struct simplefb_platform_data *pd) { - char *mode; + /* Assume 64 bytes is enough for the resolution string */ + char mode_buf[64], mode_buf_orig[64]; + char *mode = mode_buf; + const void __iomem *mode_base; int depth, ret; /* The last 16M of PCI BAR0 is used to store the resolution string. */ - mode = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M, SZ_16M); - if (!mode) + mode_base = ioremap(pci_resource_start(pdev, 0) + SZ_16M, + sizeof(mode_buf)); + if (!mode_base) return -ENOMEM; + memcpy_fromio(mode_buf, mode_base, sizeof(mode_buf) - 1); + mode_buf[sizeof(mode_buf) - 1] = '\0'; + iounmap((void __iomem *)mode_base); + memcpy(mode_buf_orig, mode_buf, sizeof(mode_buf_orig)); - /* The resolution field starts with the flag "video=". */ + /* The resolution field is required to start with "video=". */ if (!strncmp(mode, "video=", 6)) mode = mode + 6; + else { + ret = -EINVAL; + goto invalid_mode; + } - ret = kstrtoint(strsep(&mode, "x"), 10, &pd->width); + ret = kstrtouint(strsep(&mode, "x"), 10, &pd->width); if (ret) - return ret; + goto invalid_mode; - ret = kstrtoint(strsep(&mode, "-"), 10, &pd->height); + if (mode == NULL) { + ret = -EINVAL; + goto invalid_mode; + } + ret = kstrtouint(strsep(&mode, "-"), 10, &pd->height); if (ret) - return ret; + goto invalid_mode; + if (mode == NULL) { + ret = -EINVAL; + goto invalid_mode; + } ret = kstrtoint(strsep(&mode, "@"), 10, &depth); if (ret) - return ret; + goto invalid_mode; + if (depth <= 0) { + ret = -EINVAL; + goto invalid_mode; + } + if (pd->width > U32_MAX / depth) { + ret = -EOVERFLOW; + goto invalid_mode; + } pd->stride = pd->width * depth / 8; pd->format = depth == 32 ? "a8r8g8b8" : "r5g6b5"; return 0; + +invalid_mode: + dev_err(&pdev->dev, "Invalid resolution string: %*pE\n", + (int)strlen(mode_buf_orig), mode_buf_orig); + return ret; } static int ls2k_bmc_probe(struct pci_dev *dev, const struct pci_device_id *id) -- 2.49.0