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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id c18-20020a170902d49200b0016bfafffa0esm3166814plg.227.2022.08.05.07.56.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Aug 2022 07:56:24 -0700 (PDT) From: Bin Meng To: qemu-devel@nongnu.org Cc: Bin Meng , Fam Zheng , Stefan Hajnoczi , Stefan Weil , qemu-block@nongnu.org Subject: [PATCH 2/2] util/aio-win32: Correct the event array size in aio_poll() Date: Fri, 5 Aug 2022 22:56:17 +0800 Message-Id: <20220805145617.952881-2-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220805145617.952881-1-bmeng.cn@gmail.com> References: <20220805145617.952881-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102b; envelope-from=bmeng.cn@gmail.com; helo=mail-pj1-x102b.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Bin Meng WaitForMultipleObjects() can only wait for MAXIMUM_WAIT_OBJECTS object handles. Correct the event array size in aio_poll() and add a assert() to ensure it does not cause out of bound access. Signed-off-by: Bin Meng --- util/aio-win32.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/util/aio-win32.c b/util/aio-win32.c index 44003d645e..8cf5779567 100644 --- a/util/aio-win32.c +++ b/util/aio-win32.c @@ -326,7 +326,7 @@ void aio_dispatch(AioContext *ctx) bool aio_poll(AioContext *ctx, bool blocking) { AioHandler *node; - HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; + HANDLE events[MAXIMUM_WAIT_OBJECTS]; bool progress, have_select_revents, first; int count; int timeout; @@ -369,6 +369,7 @@ bool aio_poll(AioContext *ctx, bool blocking) QLIST_FOREACH_RCU(node, &ctx->aio_handlers, node) { if (!node->deleted && node->io_notify && aio_node_check(ctx, node->is_external)) { + assert(count < MAXIMUM_WAIT_OBJECTS); events[count++] = event_notifier_get_handle(node->e); } } -- 2.34.1