From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 41B3543BDA9 for ; Mon, 14 Sep 2026 11:15:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789384549; cv=none; b=piB95awZcbGAjkO2r+jnneqSYdeCZ9kt2/aVR89yg3jwOMvdqa2ztdOvXGawMKdd+gGu78PSVsVoyHHM2tH2L7bwt65EH7DNVY1tADwKfzkZwqTtScY9S1eu/y+izzmhRQxAv9F0JwU5jrSHc3UrzQiIvY7NkVyghDqeUgu6pYY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789384549; c=relaxed/simple; bh=9HD7V/aTocvKjYlWsJ0s0MGV+n+si1eE7DaK1FLGH3Q=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=ihBvXX8c39NFvwvobPyDsWI5Ua1MXZsdZHlm2uLfyRJjoN+AQEvhcqVV6C1DeVCE5S6WXbPwGOF5NQ4KADlbYuaNzYSuzkBjRyQUu56t0j6hsdLmnedNq3RvvbHu1VBAlwD/jFj2/VRWQPNqoqgNDCaISqiPfK2CmOFh/P1hvfg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SmzJkBJV; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SmzJkBJV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71BDB1F000FF; Mon, 14 Sep 2026 11:15:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789384547; bh=93mRRiGjHMn2w27wUb5qor7v2PFBGQJpUdLsU9DchWw=; h=From:To:Cc:Subject:Date; b=SmzJkBJV6liHmQJ3aUNgQBZDHoQfotUqH+Jg/g3U6wZGtNNp9fWMVanILmoNTmw82 YdEBWYgvjkxanhK7qnNEOWh9uLXMF7qkL7yIxUHIX2+hoi7hVJ2XLLLlfay9wyQJn8 vY16K3A+NFYEdKF064UjjSGV5zC3/8tf03xURhWG9gb2oR2ohtMwphLHhRB/jiQq5S 36/Nj4nYCm8A+FapkBDDcFdNvAs4kwToeLzj8Tl2YPT4hzjbbYUM+LxQO/QZzOpuL3 rrLh94ZM8lY2v/tioDmNDB3rjd7gk9W24VXhMeqTzR/EGCvo2x3QkPEvZJgKxLZKXG JRXwPTz4reilQ== From: Namjae Jeon To: linux-cifs@vger.kernel.org Cc: senozhatsky@chromium.org, tom@talpey.com, atteh.mailbox@gmail.com, chenxiaosong@chenxiaosong.com, chenxiaosong@kylinos.cn, Namjae Jeon , Mobin Aydinfar Subject: [PATCH v2] ksmbd: fix partial normalized name responses Date: Mon, 14 Sep 2026 20:15:42 +0900 Message-Id: <20260914111543.12381-1-linkinjeon@kernel.org> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Windows may request FILE_NORMALIZED_NAME_INFORMATION with an output buffer that only fits the fixed portion of the variable-length response. Treat the fixed portion as FILE_NORMALIZED_NAME_INFORMATION_SIZE so ksmbd returns STATUS_BUFFER_OVERFLOW instead of STATUS_INFO_LENGTH_MISMATCH. This avoids rejecting valid partial normalized-name responses. Fixes: 6b8b79226bc3 ("ksmbd: fix partial file information responses") Reported-by: Mobin Aydinfar Signed-off-by: Namjae Jeon --- fs/smb/server/smb2pdu.c | 3 +++ fs/smb/server/smb2pdu.h | 1 + 2 files changed, 4 insertions(+) diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index 8acc5174530b..0436b7c898b1 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -7312,6 +7312,9 @@ static int smb2_get_info_file(struct ksmbd_work *work, case FILE_ALTERNATE_NAME_INFORMATION: fixed_len = FILE_ALTERNATE_NAME_INFORMATION_SIZE; break; + case FILE_NORMALIZED_NAME_INFORMATION: + fixed_len = FILE_NORMALIZED_NAME_INFORMATION_SIZE; + break; case FILE_STREAM_INFORMATION: fixed_len = FILE_STREAM_INFORMATION_SIZE; break; diff --git a/fs/smb/server/smb2pdu.h b/fs/smb/server/smb2pdu.h index a6200d8630e2..ca8e27f7b712 100644 --- a/fs/smb/server/smb2pdu.h +++ b/fs/smb/server/smb2pdu.h @@ -212,6 +212,7 @@ struct file_sparse { #define FILE_ALLOCATION_INFORMATION_SIZE 19 #define FILE_END_OF_FILE_INFORMATION_SIZE 20 #define FILE_ALTERNATE_NAME_INFORMATION_SIZE 8 +#define FILE_NORMALIZED_NAME_INFORMATION_SIZE 8 #define FILE_STREAM_INFORMATION_SIZE 32 #define FILE_PIPE_INFORMATION_SIZE 23 #define FILE_PIPE_LOCAL_INFORMATION_SIZE 24 -- 2.25.1