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 3B7633BCD11; Thu, 16 Jul 2026 14:08:56 +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=1784210937; cv=none; b=hkUyUtp8oGnLNjCSoVGwRdrwCl78QqMnsqq6nOYJ3ixBM60WhyriCmexHUMYlyvRL5vF2wzrPe5NTlmuGm5klzktgcxrkz5tOk3AU6ckAANGBHU5wDRSllLe5cpydBCUq10vV/s5EfeNjo11GXKzhoCnWXYDnVx2biW2kVpMJQM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210937; c=relaxed/simple; bh=qs1hjUDxYgOh+hlByHZsUp4msM9lpneqj/h/PNQnO00=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G91Zi/dVWIwJoraaGbfDyIjMdWH7eMkPtMT6HffRb4fDY60fWjfSF06wPV72+BtXE/UUBPMcWtwOpJ5qFZsI63tyqzYRosVUQ3m0fgL5rnkoQLH42IkyyhBxsONHd78rRqBDaU9It8vLMe9xUxNbwg3A8x6N4iLdFNE3+5kzkJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Mfu9mAGD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Mfu9mAGD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A17011F00A3A; Thu, 16 Jul 2026 14:08:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784210936; bh=tay3TZai6NoOTqZtzdyQsDeoUZ7qP6/k8BWNB4dVuXE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Mfu9mAGDsZcNeJtYJMyW257mugDXkhUtoviCscll/iWlKR6xxeljf5qoOeCtrMYZN DEEQv5MljnNNbom+PyqxXA0sMe6P5dH5Ai64qsN6Yde8jbiuL3QxfQPbsFashxi2Ji VN410YiMZQF1gacOYmXMMsuNsn8ahpTeKxMb7ajM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Henrique Carvalho , Steve French Subject: [PATCH 6.18 230/480] smb: client: fix double-free in SMB2_ioctl() replay Date: Thu, 16 Jul 2026 15:29:37 +0200 Message-ID: <20260716133049.794028338@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133044.672218725@linuxfoundation.org> References: <20260716133044.672218725@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Henrique Carvalho commit f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9 upstream. A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_ioctl_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free. Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set") Cc: stable@vger.kernel.org Signed-off-by: Henrique Carvalho Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/client/smb2pdu.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -3425,6 +3425,8 @@ SMB2_ioctl(const unsigned int xid, struc replay_again: /* reinitialize for possible replay */ + resp_buftype = CIFS_NO_BUFFER; + memset(&rsp_iov, 0, sizeof(rsp_iov)); flags = 0; server = cifs_pick_channel(ses);