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 12DDD35F15 for ; Wed, 15 Nov 2023 22:02:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ShB9HbyI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CEEBC433C9; Wed, 15 Nov 2023 22:02:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700085734; bh=30iodzdcT3guTxcfLA2ym9xaKrq05PyjIEV0UxfjdLc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ShB9HbyIHcyNqNDv2awp1nnzi7MxoG4a4pJCkGe2H86+zMUTU9U5dazflBZ5F0tt1 SqXh7TPoMibXVxXnMovIsomwpO91ewcSnnDxvPuB2fTWnU1K2Wodo2l9bjfv7rlymz 6GvJvcNFcepKNRxYg23F9ch+WvaE2FHL6WCqWwrA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christophe JAILLET , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 5.4 019/119] ACPI: sysfs: Fix create_pnp_modalias() and create_of_modalias() Date: Wed, 15 Nov 2023 17:00:09 -0500 Message-ID: <20231115220133.207178416@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115220132.607437515@linuxfoundation.org> References: <20231115220132.607437515@linuxfoundation.org> User-Agent: quilt/0.67 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 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christophe JAILLET [ Upstream commit 48cf49d31994ff97b33c4044e618560ec84d35fb ] snprintf() does not return negative values on error. To know if the buffer was too small, the returned value needs to be compared with the length of the passed buffer. If it is greater or equal, the output has been truncated, so add checks for the truncation to create_pnp_modalias() and create_of_modalias(). Also make them return -ENOMEM in that case, as they already do that elsewhere. Moreover, the remaining size of the buffer used by snprintf() needs to be updated after the first write to avoid out-of-bounds access as already done correctly in create_pnp_modalias(), but not in create_of_modalias(), so change the latter accordingly. Fixes: 8765c5ba1949 ("ACPI / scan: Rework modalias creation when "compatible" is present") Signed-off-by: Christophe JAILLET [ rjw: Merge two patches into one, combine changelogs, add subject ] Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/acpi/device_sysfs.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c index fe8c7e79f4726..566067a855a13 100644 --- a/drivers/acpi/device_sysfs.c +++ b/drivers/acpi/device_sysfs.c @@ -156,8 +156,8 @@ static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias, return 0; len = snprintf(modalias, size, "acpi:"); - if (len <= 0) - return len; + if (len >= size) + return -ENOMEM; size -= len; @@ -210,8 +210,10 @@ static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); ACPI_FREE(buf.pointer); - if (len <= 0) - return len; + if (len >= size) + return -ENOMEM; + + size -= len; of_compatible = acpi_dev->data.of_compatible; if (of_compatible->type == ACPI_TYPE_PACKAGE) { -- 2.42.0