[{"id":3683794,"web_url":"http://patchwork.ozlabs.org/comment/3683794/","msgid":"","list_archive_url":null,"date":"2026-04-29T03:17:13","subject":"Re: [PATCH v3] smb/client: fix state corruption in smb3_reconfigure\n multichannel path","submitter":{"id":91740,"url":"http://patchwork.ozlabs.org/api/people/91740/","name":"RAJASI MANDAL","email":"rajasimandalos@gmail.com"},"content":"Hi DaeMyung,\n\nThanks for the v3. One minor suggestion\n\n> + old_chan_max = ses->chan_max;\n> + /* Synchronize ses->chan_max with the new mount context */\n> + smb3_sync_ses_chan_max(ses, ctx->max_channels);\n\nThis reads ses->chan_max without holding chan_lock.\nsmb3_sync_ses_chan_max() itself takes chan_lock for the write, and\ncifs_try_adding_channels() / cifs_chan_skip_or_disable() also access\nchan_max under chan_lock. So there is a potential data race between\nthis unlocked read and a concurrent reconnect path writing chan_max.\n\nOther than that, this patch looks good to me.\n\nThanks,\nRajasi","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=aYn1cqXB;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-11264-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"aYn1cqXB\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.208.44","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g52YP5VPwz1yHX\n\tfor ; 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Tue, 28 Apr 2026\n 20:17:25 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260416151839.3315696-1-charsyam@gmail.com>\n <20260416204539.3536168-1-charsyam@gmail.com>","In-Reply-To":"<20260416204539.3536168-1-charsyam@gmail.com>","From":"RAJASI MANDAL ","Date":"Tue, 28 Apr 2026 20:17:13 -0700","X-Gm-Features":"AVHnY4I_e5uPWJlIuzBJwy9w-CMDuIk2Vh0-JFW-klB4ZigV87Hz3BzJHxIEkIg","Message-ID":"\n ","Subject":"Re: [PATCH v3] smb/client: fix state corruption in smb3_reconfigure\n multichannel path","To":"DaeMyung Kang ","Cc":"sfrench@samba.org, pc@manguebit.org, ronniesahlberg@gmail.com,\n\tsprasad@microsoft.com, tom@talpey.com, bharathsm@microsoft.com,\n\trajasimandal@microsoft.com, henrique.carvalho@suse.com,\n\tlinux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org","Content-Type":"text/plain; charset=\"UTF-8\""}},{"id":3684018,"web_url":"http://patchwork.ozlabs.org/comment/3684018/","msgid":"","list_archive_url":null,"date":"2026-04-29T12:12:42","subject":"Re: [PATCH v3] smb/client: fix state corruption in smb3_reconfigure\n multichannel path","submitter":{"id":93166,"url":"http://patchwork.ozlabs.org/api/people/93166/","name":"DaeMyung Kang","email":"charsyam@gmail.com"},"content":"Hi Rajasi,\n\nThanks a lot for the careful review — you're right, that read of\nses->chan_max was unprotected and races with chan_lock writers in\ncifs_try_adding_channels() / cifs_chan_skip_or_disable().\n\nv4 fixes this by folding the read into smb3_sync_ses_chan_max()\nitself: the helper now returns the previous chan_max value, so the\nread+write happens atomically under chan_lock. The caller no longer\nreads ses->chan_max outside the lock. I also switched the helper's\nparameter/return type to size_t to match struct cifs_ses::chan_max.\n\nWhile I was at it, I also restored ctx->multichannel_specified and\nctx->max_channels_specified together\nwith multichannel / max_channels on the rollback path,\nso the user-specified flags don't end up out of sync with\nthe restored values once smb3_fs_context_dup() copies the ctx back.\nv4 just went out — would appreciate another look when you get a chance.\n\nThanks,\nDaeMyung\n\n\n2026년 4월 29일 (수) 오후 12:17, RAJASI MANDAL 님이 작성:\n>\n> Hi DaeMyung,\n>\n> Thanks for the v3. One minor suggestion\n>\n> > + old_chan_max = ses->chan_max;\n> > + /* Synchronize ses->chan_max with the new mount context */\n> > + smb3_sync_ses_chan_max(ses, ctx->max_channels);\n>\n> This reads ses->chan_max without holding chan_lock.\n> smb3_sync_ses_chan_max() itself takes chan_lock for the write, and\n> cifs_try_adding_channels() / cifs_chan_skip_or_disable() also access\n> chan_max under chan_lock. So there is a potential data race between\n> this unlocked read and a concurrent reconnect path writing chan_max.\n>\n> Other than that, this patch looks good to me.\n>\n> Thanks,\n> Rajasi","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=W5/4gXDi;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-11274-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"W5/4gXDi\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=74.125.224.42","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5GWn1l2Dz1yHZ\n\tfor ; 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