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Sashiko AI review found 1 potential issue(s) to consider: > - [High] net: iavf: missing bounds check on num_vsis causes out-of-bounds write > -- > > commit 96fe4c02ff0c0cd29e48e38845a6fbbedd204284 > Author: Przemek Kitszel > > iavf: temporary rename of IAVF_MAX_REQ_QUEUES to IAVF_MAX_REQ_QUEUES_VCV1 > > Rename IAVF_MAX_REQ_QUEUES to IAVF_MAX_REQ_QUEUES_VCV1, in preparation for > the next patch that will extend the max to 256, using old value of 16 for > the "v1" variant of virtchnl opcodes. > >> diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c >> --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c >> +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c >> @@ -268,19 +268,19 @@ int iavf_send_vf_ptp_caps_msg(struct iavf_adapter *adapter) >> **/ >> static void iavf_validate_num_queues(struct iavf_adapter *adapter) >> { >> - if (adapter->vf_res->num_queue_pairs > IAVF_MAX_REQ_QUEUES) { >> + if (adapter->vf_res->num_queue_pairs > IAVF_MAX_REQ_QUEUES_VCV1) { >> struct virtchnl_vsi_resource *vsi_res; >> int i; >> >> dev_info(&adapter->pdev->dev, "Received %d queues, but can only have a max of %d\n", >> adapter->vf_res->num_queue_pairs, >> - IAVF_MAX_REQ_QUEUES); >> + IAVF_MAX_REQ_QUEUES_VCV1); >> dev_info(&adapter->pdev->dev, "Fixing by reducing queues to %d\n", >> - IAVF_MAX_REQ_QUEUES); >> - adapter->vf_res->num_queue_pairs = IAVF_MAX_REQ_QUEUES; >> + IAVF_MAX_REQ_QUEUES_VCV1); >> + adapter->vf_res->num_queue_pairs = IAVF_MAX_REQ_QUEUES_VCV1; >> for (i = 0; i < adapter->vf_res->num_vsis; i++) { >> vsi_res = &adapter->vf_res->vsi_res[i]; >> - vsi_res->num_queue_pairs = IAVF_MAX_REQ_QUEUES; >> + vsi_res->num_queue_pairs = IAVF_MAX_REQ_QUEUES_VCV1; > > [Severity: High] > Can a maliciously large num_vsis value from the PF cause an out-of-bounds > write here? > > In iavf_get_vf_config(), the message from the PF is copied into > adapter->vf_res without validating num_vsis against the allocation > size: this is both pre-existing and we should trust PF, will ignore