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Wed, 7 Apr 2021 01:46:49 -0400 (EDT) From: Klaus Jensen To: qemu-devel@nongnu.org Subject: [PULL for-6.0 v2 08/10] hw/block/nvme: fix ns attachment out-of-bounds read Date: Wed, 7 Apr 2021 07:46:33 +0200 Message-Id: <20210407054635.189440-9-its@irrelevant.dk> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210407054635.189440-1-its@irrelevant.dk> References: <20210407054635.189440-1-its@irrelevant.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=66.111.4.29; envelope-from=its@irrelevant.dk; helo=out5-smtp.messagingengine.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org, Klaus Jensen , Max Reitz , Klaus Jensen , Minwoo Im , Stefan Hajnoczi , Keith Busch Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Klaus Jensen nvme_ns_attachment() does not verify the contents of the host-supplied 16 bit "Number of Identifiers" field in the command payload. Make sure the value is capped at 2047 and fix the out-of-bounds read. Fixes: 645ce1a70cb6 ("hw/block/nvme: support namespace attachment command") Cc: Minwoo Im Signed-off-by: Klaus Jensen Reviewed-by: Minwoo Im --- hw/block/nvme.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index d2dd82496790..87891d4d0f3b 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -4920,6 +4920,7 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req) return NVME_NS_CTRL_LIST_INVALID | NVME_DNR; } + *nr_ids = MIN(*nr_ids, NVME_CONTROLLER_LIST_SIZE - 1); for (i = 0; i < *nr_ids; i++) { ctrl = nvme_subsys_ctrl(n->subsys, ids[i]); if (!ctrl) { -- 2.31.1