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 B614F1A7264; Mon, 10 Mar 2025 17:33:07 +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=1741627987; cv=none; b=UZ8ZM0lFqQvqKv3xudalAq1gmyvUd6fynoFHbmvaeoz75i4gv9w/MKPJ9YnFx/5DJFGxu8HTMGb83dmoycfEwVphs4DCGSGDT8NhjegKMD8fmV65NYhNsudMX8A3qHdbDzJcIjjiS8mdSJ4TFX58kXKYkdPX5q0cK5EOaaRPiYM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741627987; c=relaxed/simple; bh=hm+bWetTLthqzLAv+Hb+LIspyP7LS9jm4gEwF5d8Zoo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sUYIrpfgMIMcdblNSbRHsJHCHPtMCmb7A9aJ9tG+osT7bCBjwcNvfw4wxdn5qkWq/LMrMoSHanCkgl1PENLt/vGSpgah6ViO/Ad/6qPJjdEG+FE0IbLTeB/KxOpHvpDLwRBuwMuNFYk0EBhc3Y1IirtqLvJW6cLB9oHYtrIsudg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xkVpqNqK; 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="xkVpqNqK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D77B9C4CEE5; Mon, 10 Mar 2025 17:33:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741627987; bh=hm+bWetTLthqzLAv+Hb+LIspyP7LS9jm4gEwF5d8Zoo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xkVpqNqKxw6LYKUnlAnTuizlNgRcerG6JqDSomN3rjlHKJkOw3AhxWp8OiIg6kMq3 RlGoJAggJXvPOkg4qkYsmiiMVo20YwlvRMj1DQBSuTp7HY6lIPf6ZKxJKUdQwJcC9M UeOjZ5T284qTFcQQk48/+Ob0OlyLCSLUuxNvzaVc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Norbert Szetei , Namjae Jeon , Steve French Subject: [PATCH 6.6 031/145] ksmbd: fix use-after-free in smb2_lock Date: Mon, 10 Mar 2025 18:05:25 +0100 Message-ID: <20250310170435.992082350@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170434.733307314@linuxfoundation.org> References: <20250310170434.733307314@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Namjae Jeon commit 84d2d1641b71dec326e8736a749b7ee76a9599fc upstream. If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine. Cc: stable@vger.kernel.org Reported-by: Norbert Szetei Tested-by: Norbert Szetei Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/smb2pdu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -7442,13 +7442,13 @@ out_check_cl: } no_check_cl: + flock = smb_lock->fl; + list_del(&smb_lock->llist); + if (smb_lock->zero_len) { err = 0; goto skip; } - - flock = smb_lock->fl; - list_del(&smb_lock->llist); retry: rc = vfs_lock_file(filp, smb_lock->cmd, flock, NULL); skip: