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 1EE44FBE7 for ; Mon, 15 May 2023 16:42:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79E1AC433EF; Mon, 15 May 2023 16:42:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684168947; bh=eWOD+ctRbSmWXvkox3o3YYIKB0MxRx4s2aqLfpxkaXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Sl1UgRfaagA5VjyUfxtJJpT6Dl9cuQdxgot5vGTWdr/UbLI3lVZnxuG0MBbvLHPcT VnlQ22MduPz4qNit/QnZIKt3BiIm9eTFB6tAYobeuDZMw0SOJtju1i0uVAW/zKbAm3 5lrCyxCI8suZfF5iXDw/tFAyHRYPlabyZP1QLUq8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wei Chen , Simon Horman , Kalle Valo , Sasha Levin Subject: [PATCH 4.19 063/191] wifi: rtlwifi: fix incorrect error codes in rtl_debugfs_set_write_reg() Date: Mon, 15 May 2023 18:25:00 +0200 Message-Id: <20230515161709.494341149@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161707.203549282@linuxfoundation.org> References: <20230515161707.203549282@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Wei Chen [ Upstream commit 5dbe1f8eb8c5ac69394400a5b86fd81775e96c43 ] If there is a failure during copy_from_user or user-provided data buffer is invalid, rtl_debugfs_set_write_reg should return negative error code instead of a positive value count. Fix this bug by returning correct error code. Moreover, the check of buffer against null is removed since it will be handled by copy_from_user. Fixes: 610247f46feb ("rtlwifi: Improve debugging by using debugfs") Signed-off-by: Wei Chen Reviewed-by: Simon Horman Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20230326054217.93492-1-harperchen1110@gmail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtlwifi/debug.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/debug.c b/drivers/net/wireless/realtek/rtlwifi/debug.c index deacc7a28d3a7..6a0dfc6d4905e 100644 --- a/drivers/net/wireless/realtek/rtlwifi/debug.c +++ b/drivers/net/wireless/realtek/rtlwifi/debug.c @@ -319,8 +319,8 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp, tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count); - if (!buffer || copy_from_user(tmp, buffer, tmp_len)) - return count; + if (copy_from_user(tmp, buffer, tmp_len)) + return -EFAULT; tmp[tmp_len] = '\0'; @@ -328,7 +328,7 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp, num = sscanf(tmp, "%x %x %x", &addr, &val, &len); if (num != 3) - return count; + return -EINVAL; switch (len) { case 1: -- 2.39.2