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 CC8441A00F0; Mon, 23 Mar 2026 15:10:37 +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=1774278637; cv=none; b=BLuXfvLimmQ/3RmmstEU1OwDKN20RLREx8oq+kCpwQHOYFxzR8XN9BkehKU/C4dkdgYy/kuzQC2fr5+cqvqS5VqEndKpuRN2lfuYyMlYJI7Opp68kxz4x8UVZUyWaklVrUMPpC7PZ7RFcpKw+LW0vKRZ1JXoINids5nvtOkeYXg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774278637; c=relaxed/simple; bh=HcomlFf98fbDfsKOGt0R3SmRFkQYqI4K6BpnIRLX9tY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EmQdl4qS9102q1UHEvNguV1UXG/66rFGa/3B2NDe7vV5CaxmwMMeuGytt4MxdHNFA8Ica8Mub0lNR07jc4JM9sWGMRr1L4MWeg4AG50/v6Tf3rsj0kBKVoqPTgBd6zmI9naue+KU4KmyZYIB/Wd8BDreZOc36Posug96bbj9U4U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uGeMa8JV; 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="uGeMa8JV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 506EFC4CEF7; Mon, 23 Mar 2026 15:10:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774278637; bh=HcomlFf98fbDfsKOGt0R3SmRFkQYqI4K6BpnIRLX9tY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uGeMa8JVzt8GSX0Kiw3teY0X0luszpglSLwX8t5IK4vHNUH6f1rPea+OOrKdlQaLi rlaMBS2kaJTmEN2CDgc8OM7RKw8X13fUvVvV7BULilRR4qvYUzoFQrgRYzBy56ic26 cgNUetbg4NFcRMh6EBFbTGBSzTu2L6KaA1tGO168= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Namjae Jeon , Steve French Subject: [PATCH 6.6 328/567] ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close() Date: Mon, 23 Mar 2026 14:44:08 +0100 Message-ID: <20260323134541.947706856@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323134533.749096647@linuxfoundation.org> References: <20260323134533.749096647@linuxfoundation.org> User-Agent: quilt/0.69 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 eac3361e3d5dd8067b3258c69615888eb45e9f25 upstream. opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being accessed after rcu_read_unlock() has been called. This creates a race condition where the memory could be freed by a concurrent writer between the unlock and the subsequent pointer dereferences (opinfo->is_lease, etc.), leading to a use-after-free. Fixes: 5fb282ba4fef ("ksmbd: fix possible null-deref in smb_lazy_parent_lease_break_close") Cc: stable@vger.kernel.org Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/oplock.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/fs/smb/server/oplock.c +++ b/fs/smb/server/oplock.c @@ -1123,10 +1123,12 @@ void smb_lazy_parent_lease_break_close(s rcu_read_lock(); opinfo = rcu_dereference(fp->f_opinfo); - rcu_read_unlock(); - if (!opinfo || !opinfo->is_lease || opinfo->o_lease->version != 2) + if (!opinfo || !opinfo->is_lease || opinfo->o_lease->version != 2) { + rcu_read_unlock(); return; + } + rcu_read_unlock(); p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent); if (!p_ci)