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 2EC48346E72; Wed, 3 Dec 2025 16:00:22 +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=1764777622; cv=none; b=n7tDeicfziNx5VJHkxQAwvxrYWu/M7trgHU8GPofnic7HfJ+/SQ1wFwcNRWPvnZRNR4U2mwE8hhd90XRq/hFD2Qcj+cWIy7QDhOb05nt0aXqQikDSQLEXcE8sOUPqYQBztznvT2tyo33rtxFl6ea7BSrlXIh0evsCHblrxGskQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764777622; c=relaxed/simple; bh=+AMqbujxpTymEembM702tCSVaM9eXHgAPGw08IU24A4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JFLMMYw1PcLhNQAmdQrPiZVTu4IM9+SP19qmi/XMBKJXPB8Uw6kGc7MIHi5EsXtVOKCDj19KMWNw9x4ztK+OGmJsWu1Yj7Brn8gXWzCFHuAggNQza8yGsb4OFJfxgnLBNBRb2E3o/PXq/pc/z2u7445v11lLA8SgQlW4BeMXqtg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1oeXN28D; 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="1oeXN28D" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71CB6C4CEF5; Wed, 3 Dec 2025 16:00:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764777622; bh=+AMqbujxpTymEembM702tCSVaM9eXHgAPGw08IU24A4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1oeXN28DrjlK6bNS2SHHxwiRspolqOf9puhsEvOm5ZkoAyuIIyb/oe/F8lTKwhWRK HeMdbyQrA6PlbttOdveN6KgWJamunYxOMwzgYcuTmes892Xak9enjhgUvAVDx//7qX 3ee9DBO92w6T61KgJtzEH3LC9Uyt9O/P3tJAwFjY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Seyediman Seyedarab , Danilo Krummrich , Sasha Levin Subject: [PATCH 5.15 093/392] drm/nouveau: replace snprintf() with scnprintf() in nvkm_snprintbf() Date: Wed, 3 Dec 2025 16:24:03 +0100 Message-ID: <20251203152417.524915159@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152414.082328008@linuxfoundation.org> References: <20251203152414.082328008@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev 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: Seyediman Seyedarab [ Upstream commit 6510b62fe9303aaf48ff136ff69186bcfc32172d ] snprintf() returns the number of characters that *would* have been written, which can overestimate how much you actually wrote to the buffer in case of truncation. That leads to 'data += this' advancing the pointer past the end of the buffer and size going negative. Switching to scnprintf() prevents potential buffer overflows and ensures consistent behavior when building the output string. Signed-off-by: Seyediman Seyedarab Link: https://lore.kernel.org/r/20250724195913.60742-1-ImanDevel@gmail.com Signed-off-by: Danilo Krummrich Signed-off-by: Sasha Levin --- drivers/gpu/drm/nouveau/nvkm/core/enum.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/nouveau/nvkm/core/enum.c b/drivers/gpu/drm/nouveau/nvkm/core/enum.c index b9581feb24ccb..a23b40b27b81b 100644 --- a/drivers/gpu/drm/nouveau/nvkm/core/enum.c +++ b/drivers/gpu/drm/nouveau/nvkm/core/enum.c @@ -44,7 +44,7 @@ nvkm_snprintbf(char *data, int size, const struct nvkm_bitfield *bf, u32 value) bool space = false; while (size >= 1 && bf->name) { if (value & bf->mask) { - int this = snprintf(data, size, "%s%s", + int this = scnprintf(data, size, "%s%s", space ? " " : "", bf->name); size -= this; data += this; -- 2.51.0