From: Yi Zhang <yizhan-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> To: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org> Cc: linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org> Subject: Re: [PATCH v2] nvmet-rdma: Fix a possible uninitialized variable dereference Date: Tue, 14 Mar 2017 09:40:27 -0400 (EDT) [thread overview] Message-ID: <1898652754.2479312.1489498827670.JavaMail.zimbra@redhat.com> (raw) In-Reply-To: <1489412381-28947-1-git-send-email-sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org> Thanks Sagi Tested-by: Yi Zhang <yizhan-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Best Regards, Yi Zhang ----- Original Message ----- From: "Sagi Grimberg" <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org> To: linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: "Christoph Hellwig" <hch-jcswGhMUV9g@public.gmane.org> Sent: Monday, March 13, 2017 9:39:41 PM Subject: [PATCH v2] nvmet-rdma: Fix a possible uninitialized variable dereference When handling a new recv command, we grab a new rsp resource and check for the queue state being live. In case the queue is not in live state, we simply restore the rsp back to the free list. However in this flow we didn't set rsp->queue yet, so we cannot dereference it. Instead, make sure to initialize rsp->queue (and other rsp members) as soon as possible so we won't reference uninitialized variables. Reported-by: Yi Zhang <yizhan-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Reported-by: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org> Signed-off-by: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org> --- - v1 broke srq, this one doesn't drivers/nvme/target/rdma.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 9aa1da3778b3..ecc4fe862561 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -703,11 +703,6 @@ static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, { u16 status; - cmd->queue = queue; - cmd->n_rdma = 0; - cmd->req.port = queue->port; - - ib_dma_sync_single_for_cpu(queue->dev->device, cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length, DMA_FROM_DEVICE); @@ -760,9 +755,12 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) cmd->queue = queue; rsp = nvmet_rdma_get_rsp(queue); + rsp->queue = queue; rsp->cmd = cmd; rsp->flags = 0; rsp->req.cmd = cmd->nvme_cmd; + rsp->req.port = queue->port; + rsp->n_rdma = 0; if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { unsigned long flags; -- 2.7.4 _______________________________________________ Linux-nvme mailing list Linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org http://lists.infradead.org/mailman/listinfo/linux-nvme -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: yizhan@redhat.com (Yi Zhang) Subject: [PATCH v2] nvmet-rdma: Fix a possible uninitialized variable dereference Date: Tue, 14 Mar 2017 09:40:27 -0400 (EDT) [thread overview] Message-ID: <1898652754.2479312.1489498827670.JavaMail.zimbra@redhat.com> (raw) In-Reply-To: <1489412381-28947-1-git-send-email-sagi@grimberg.me> Thanks Sagi Tested-by: Yi Zhang <yizhan at redhat.com> Best Regards, Yi Zhang ----- Original Message ----- From: "Sagi Grimberg" <sagi@grimberg.me> To: linux-nvme at lists.infradead.org, linux-rdma at vger.kernel.org Cc: "Christoph Hellwig" <hch at lst.de> Sent: Monday, March 13, 2017 9:39:41 PM Subject: [PATCH v2] nvmet-rdma: Fix a possible uninitialized variable dereference When handling a new recv command, we grab a new rsp resource and check for the queue state being live. In case the queue is not in live state, we simply restore the rsp back to the free list. However in this flow we didn't set rsp->queue yet, so we cannot dereference it. Instead, make sure to initialize rsp->queue (and other rsp members) as soon as possible so we won't reference uninitialized variables. Reported-by: Yi Zhang <yizhan at redhat.com> Reported-by: Raju Rangoju <rajur at chelsio.com> Signed-off-by: Sagi Grimberg <sagi at grimberg.me> --- - v1 broke srq, this one doesn't drivers/nvme/target/rdma.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 9aa1da3778b3..ecc4fe862561 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -703,11 +703,6 @@ static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, { u16 status; - cmd->queue = queue; - cmd->n_rdma = 0; - cmd->req.port = queue->port; - - ib_dma_sync_single_for_cpu(queue->dev->device, cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length, DMA_FROM_DEVICE); @@ -760,9 +755,12 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) cmd->queue = queue; rsp = nvmet_rdma_get_rsp(queue); + rsp->queue = queue; rsp->cmd = cmd; rsp->flags = 0; rsp->req.cmd = cmd->nvme_cmd; + rsp->req.port = queue->port; + rsp->n_rdma = 0; if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { unsigned long flags; -- 2.7.4 _______________________________________________ Linux-nvme mailing list Linux-nvme at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2017-03-14 13:40 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-13 13:39 [PATCH v2] nvmet-rdma: Fix a possible uninitialized variable dereference Sagi Grimberg 2017-03-13 13:39 ` Sagi Grimberg [not found] ` <1489412381-28947-1-git-send-email-sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org> 2017-03-13 19:56 ` Christoph Hellwig 2017-03-13 19:56 ` Christoph Hellwig 2017-03-14 12:56 ` Raju Rangoju 2017-03-14 12:56 ` Raju Rangoju 2017-03-14 13:40 ` Yi Zhang [this message] 2017-03-14 13:40 ` Yi Zhang
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