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 AB7AF271462; Wed, 10 Dec 2025 07:31:45 +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=1765351905; cv=none; b=rkaaqaanVpZpWQl/Zg61RFzmLrqmkAL+YS3kJA4MaA86Xjyth9STvJxyWmRSbpNRO6Rd7bAT5WS3MSgsBjZLZbBDDnD34zNFmi0RQpFHJULpvQ3Qhu0huMx2WwzU658LcDbnR+U8iOfy3rrHoBtEz9+NbivZ25Po/vhC4jfXzn4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765351905; c=relaxed/simple; bh=8H3yXVXMpz5xb54qFosG/fhO+XA3ozXk+uweaxQYpNw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cpwj4XyHVdQaWZKWWptIV2FbzfoEPI2ERd9hQt3Jes6TWXwNRVXGOqfVS3kBfzaiG1JISZ2rYm+Ilh+p/eYAGkT8N0uc4x5rJ5MdAfcdE+zgNg9oL4tYbrIv/7wp0xKRjoQ2r1BH4+SHhoaY+6HFtI+XxVM7z2O/XeMWXxosUWE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=haHLaXMc; 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="haHLaXMc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31E88C19423; Wed, 10 Dec 2025 07:31:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765351905; bh=8H3yXVXMpz5xb54qFosG/fhO+XA3ozXk+uweaxQYpNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=haHLaXMceonIxSmgtGmAUNCK1Jl9xM/slOdW4xvCY3BPpK/fdFoTOpfb5lv1FoTSV 7plsakwqxHOtJDJkU0DR81kwZDq6R0NNWnvbfLimKd16TZRU6IqLb7xhIoHwDZHoFs 4bocPtM5hWLuypyYJlubDhFnkxvu7NRseAuUVWLQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yiqi Sun , Steve French , Sasha Levin Subject: [PATCH 6.12 25/49] smb: fix invalid username check in smb3_fs_context_parse_param() Date: Wed, 10 Dec 2025 16:29:55 +0900 Message-ID: <20251210072948.789535436@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251210072948.125620687@linuxfoundation.org> References: <20251210072948.125620687@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yiqi Sun [ Upstream commit ed6612165b74f09db00ef0abaf9831895ab28b7f ] Since the maximum return value of strnlen(..., CIFS_MAX_USERNAME_LEN) is CIFS_MAX_USERNAME_LEN, length check in smb3_fs_context_parse_param() is always FALSE and invalid. Fix the comparison in if statement. Signed-off-by: Yiqi Sun Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/client/fs_context.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c index 9a4492106c25f..17133adfe798b 100644 --- a/fs/smb/client/fs_context.c +++ b/fs/smb/client/fs_context.c @@ -1415,7 +1415,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, break; } - if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) > + if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) == CIFS_MAX_USERNAME_LEN) { pr_warn("username too long\n"); goto cifs_parse_mount_err; -- 2.51.0