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Tsirkin" , Keith Busch , David Hildenbrand , qemu-trivial@nongnu.org, Hanna Reitz , Klaus Jensen Subject: [PATCH v2 21/51] hw/nvme: remove copy bh scheduling Date: Mon, 5 Dec 2022 10:51:58 +0100 Message-Id: <20221205095228.1314-22-quintela@redhat.com> In-Reply-To: <20221205095228.1314-1-quintela@redhat.com> References: <20221205095228.1314-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass client-ip=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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: 2.1.29 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Klaus Jensen Fix a potential use-after-free by removing the bottom half and enqueuing the completion directly. Fixes: 796d20681d9b ("hw/nvme: reimplement the copy command to allow aio cancellation") Reviewed-by: Keith Busch Signed-off-by: Klaus Jensen --- hw/nvme/ctrl.c | 63 +++++++++++--------------------------------------- 1 file changed, 14 insertions(+), 49 deletions(-) diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c index e847b89461..e54276dc1d 100644 --- a/hw/nvme/ctrl.c +++ b/hw/nvme/ctrl.c @@ -2552,7 +2552,6 @@ typedef struct NvmeCopyAIOCB { BlockAIOCB common; BlockAIOCB *aiocb; NvmeRequest *req; - QEMUBH *bh; int ret; void *ranges; @@ -2590,9 +2589,8 @@ static const AIOCBInfo nvme_copy_aiocb_info = { .cancel_async = nvme_copy_cancel, }; -static void nvme_copy_bh(void *opaque) +static void nvme_copy_done(NvmeCopyAIOCB *iocb) { - NvmeCopyAIOCB *iocb = opaque; NvmeRequest *req = iocb->req; NvmeNamespace *ns = req->ns; BlockAcctStats *stats = blk_get_stats(ns->blkconf.blk); @@ -2604,9 +2602,6 @@ static void nvme_copy_bh(void *opaque) qemu_iovec_destroy(&iocb->iov); g_free(iocb->bounce); - qemu_bh_delete(iocb->bh); - iocb->bh = NULL; - if (iocb->ret < 0) { block_acct_failed(stats, &iocb->acct.read); block_acct_failed(stats, &iocb->acct.write); @@ -2619,7 +2614,7 @@ static void nvme_copy_bh(void *opaque) qemu_aio_unref(iocb); } -static void nvme_copy_cb(void *opaque, int ret); +static void nvme_do_copy(NvmeCopyAIOCB *iocb); static void nvme_copy_source_range_parse_format0(void *ranges, int idx, uint64_t *slba, uint32_t *nlb, @@ -2731,7 +2726,7 @@ static void nvme_copy_out_completed_cb(void *opaque, int ret) iocb->idx++; iocb->slba += nlb; out: - nvme_copy_cb(iocb, iocb->ret); + nvme_do_copy(iocb); } static void nvme_copy_out_cb(void *opaque, int ret) @@ -2743,16 +2738,8 @@ static void nvme_copy_out_cb(void *opaque, int ret) size_t mlen; uint8_t *mbounce; - if (ret < 0) { - iocb->ret = ret; + if (ret < 0 || iocb->ret < 0 || !ns->lbaf.ms) { goto out; - } else if (iocb->ret < 0) { - goto out; - } - - if (!ns->lbaf.ms) { - nvme_copy_out_completed_cb(iocb, 0); - return; } nvme_copy_source_range_parse(iocb->ranges, iocb->idx, iocb->format, NULL, @@ -2771,7 +2758,7 @@ static void nvme_copy_out_cb(void *opaque, int ret) return; out: - nvme_copy_cb(iocb, ret); + nvme_copy_out_completed_cb(iocb, ret); } static void nvme_copy_in_completed_cb(void *opaque, int ret) @@ -2865,15 +2852,9 @@ static void nvme_copy_in_completed_cb(void *opaque, int ret) invalid: req->status = status; - iocb->aiocb = NULL; - if (iocb->bh) { - qemu_bh_schedule(iocb->bh); - } - - return; - + iocb->ret = -1; out: - nvme_copy_cb(iocb, ret); + nvme_do_copy(iocb); } static void nvme_copy_in_cb(void *opaque, int ret) @@ -2884,16 +2865,8 @@ static void nvme_copy_in_cb(void *opaque, int ret) uint64_t slba; uint32_t nlb; - if (ret < 0) { - iocb->ret = ret; + if (ret < 0 || iocb->ret < 0 || !ns->lbaf.ms) { goto out; - } else if (iocb->ret < 0) { - goto out; - } - - if (!ns->lbaf.ms) { - nvme_copy_in_completed_cb(iocb, 0); - return; } nvme_copy_source_range_parse(iocb->ranges, iocb->idx, iocb->format, &slba, @@ -2909,12 +2882,11 @@ static void nvme_copy_in_cb(void *opaque, int ret) return; out: - nvme_copy_cb(iocb, iocb->ret); + nvme_copy_in_completed_cb(iocb, ret); } -static void nvme_copy_cb(void *opaque, int ret) +static void nvme_do_copy(NvmeCopyAIOCB *iocb) { - NvmeCopyAIOCB *iocb = opaque; NvmeRequest *req = iocb->req; NvmeNamespace *ns = req->ns; uint64_t slba; @@ -2922,10 +2894,7 @@ static void nvme_copy_cb(void *opaque, int ret) size_t len; uint16_t status; - if (ret < 0) { - iocb->ret = ret; - goto done; - } else if (iocb->ret < 0) { + if (iocb->ret < 0) { goto done; } @@ -2972,14 +2941,11 @@ static void nvme_copy_cb(void *opaque, int ret) invalid: req->status = status; + iocb->ret = -1; done: - iocb->aiocb = NULL; - if (iocb->bh) { - qemu_bh_schedule(iocb->bh); - } + nvme_copy_done(iocb); } - static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req) { NvmeNamespace *ns = req->ns; @@ -3049,7 +3015,6 @@ static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req) } iocb->req = req; - iocb->bh = qemu_bh_new(nvme_copy_bh, iocb); iocb->ret = 0; iocb->nr = nr; iocb->idx = 0; @@ -3066,7 +3031,7 @@ static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req) BLOCK_ACCT_WRITE); req->aiocb = &iocb->common; - nvme_copy_cb(iocb, 0); + nvme_do_copy(iocb); return NVME_NO_COMPLETE; -- 2.38.1