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 57C152EF65C; Tue, 15 Jul 2025 13:46:27 +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=1752587187; cv=none; b=H2np/8Qu3P/7mhH1dVynW/xBPhiSvajwv+FaDZbxBQaSGbW0sRYYzSjhKNb++mQCmL9TnOsXyQ7Lgd3l1rrupXgzc008Tee4p4A9nfsAxotFj7zwcph9/MylxYP1g7RqiWlfIt/++f9c26rx5/BwpXauOL7T6mZcZepV5f6tFj4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752587187; c=relaxed/simple; bh=rjQpVgcrU0aOojY2DtM5IBPQZPdMUtqCYSlZepI9XQc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sHLljJsCR1UDY0Vd0XijwrVLRpxDFOuAjrdoswyXJ8L5mjcgacL9/AorhOMy7wbQ7heiIA75HzbvRTWLIufbLvZWo1DwYLXZsvuAjdsYff9U1QAcbaEsQbIn6hkFi8Em8rhJirKkKtB7vxytU0YLHBOrbccWxP7BkJCgjHlQtP8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mj/tRcQ/; 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="mj/tRcQ/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF292C4CEE3; Tue, 15 Jul 2025 13:46:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752587187; bh=rjQpVgcrU0aOojY2DtM5IBPQZPdMUtqCYSlZepI9XQc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mj/tRcQ/zdudN05p/TlS/Xp/R00phNaihDwdjBlyQIZ6zkGhjMsupZ7WymcDmLQg2 KUS+RuguhuCsTrtetioNce5JiHDHWZT3mixeYxWQj7CAGKkeI+1VXcpY/4yJ/c/Er/ AmQpaCJbuXP9mq0XeYrSfOSwu76PqJ2uW1Jds7g4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ziyan Xu , Namjae Jeon , Steve French Subject: [PATCH 6.15 192/192] ksmbd: fix potential use-after-free in oplock/lease break ack Date: Tue, 15 Jul 2025 15:14:47 +0200 Message-ID: <20250715130822.629147906@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130814.854109770@linuxfoundation.org> References: <20250715130814.854109770@linuxfoundation.org> User-Agent: quilt/0.68 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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Namjae Jeon commit 50f930db22365738d9387c974416f38a06e8057e upstream. If ksmbd_iov_pin_rsp return error, use-after-free can happen by accessing opinfo->state and opinfo_put and ksmbd_fd_put could called twice. Reported-by: Ziyan Xu Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/smb2pdu.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-) --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -8535,11 +8535,6 @@ static void smb20_oplock_break_ack(struc goto err_out; } - opinfo->op_state = OPLOCK_STATE_NONE; - wake_up_interruptible_all(&opinfo->oplock_q); - opinfo_put(opinfo); - ksmbd_fd_put(work, fp); - rsp->StructureSize = cpu_to_le16(24); rsp->OplockLevel = rsp_oplevel; rsp->Reserved = 0; @@ -8547,16 +8542,15 @@ static void smb20_oplock_break_ack(struc rsp->VolatileFid = volatile_id; rsp->PersistentFid = persistent_id; ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_oplock_break)); - if (!ret) - return; - + if (ret) { err_out: + smb2_set_err_rsp(work); + } + opinfo->op_state = OPLOCK_STATE_NONE; wake_up_interruptible_all(&opinfo->oplock_q); - opinfo_put(opinfo); ksmbd_fd_put(work, fp); - smb2_set_err_rsp(work); } static int check_lease_state(struct lease *lease, __le32 req_state) @@ -8686,11 +8680,6 @@ static void smb21_lease_break_ack(struct } lease_state = lease->state; - opinfo->op_state = OPLOCK_STATE_NONE; - wake_up_interruptible_all(&opinfo->oplock_q); - atomic_dec(&opinfo->breaking_cnt); - wake_up_interruptible_all(&opinfo->oplock_brk); - opinfo_put(opinfo); rsp->StructureSize = cpu_to_le16(36); rsp->Reserved = 0; @@ -8699,16 +8688,16 @@ static void smb21_lease_break_ack(struct rsp->LeaseState = lease_state; rsp->LeaseDuration = 0; ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_lease_ack)); - if (!ret) - return; - + if (ret) { err_out: + smb2_set_err_rsp(work); + } + + opinfo->op_state = OPLOCK_STATE_NONE; wake_up_interruptible_all(&opinfo->oplock_q); atomic_dec(&opinfo->breaking_cnt); wake_up_interruptible_all(&opinfo->oplock_brk); - opinfo_put(opinfo); - smb2_set_err_rsp(work); } /**