Message ID | 20210412121846.144565-2-vsementsov@virtuozzo.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Mon, 12 Apr 2021 12:19:07 +0000 From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, eblake@redhat.com, vsementsov@virtuozzo.com, peter.maydell@linaro.org, rvkagan@yandex-team.ru Subject: [PULL 1/1] block/nbd: fix possible use after free of s->connect_thread Date: Mon, 12 Apr 2021 15:18:46 +0300 Message-Id: <20210412121846.144565-2-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210412121846.144565-1-vsementsov@virtuozzo.com> References: <20210412121846.144565-1-vsementsov@virtuozzo.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [185.215.60.212] X-ClientProxiedBy: ZR0P278CA0153.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:41::20) To AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (185.215.60.212) by ZR0P278CA0153.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:41::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.21 via Frontend Transport; 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[PULL,1/1] block/nbd: fix possible use after free of s->connect_thread
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expand
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diff --git a/block/nbd.c b/block/nbd.c index c26dc5a54f..1d4668d42d 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -443,6 +443,11 @@ nbd_co_establish_connection(BlockDriverState *bs, Error **errp) BDRVNBDState *s = bs->opaque; NBDConnectThread *thr = s->connect_thread; + if (!thr) { + /* detached */ + return -1; + } + qemu_mutex_lock(&thr->mutex); switch (thr->state) { @@ -486,6 +491,12 @@ nbd_co_establish_connection(BlockDriverState *bs, Error **errp) s->wait_connect = true; qemu_coroutine_yield(); + if (!s->connect_thread) { + /* detached */ + return -1; + } + assert(thr == s->connect_thread); + qemu_mutex_lock(&thr->mutex); switch (thr->state) {