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scsi: be2iscsi: Fix use-after-free during IP updates
This fixes a bug found by Lv Yunlong where, because beiscsi_exec_nemb_cmd() frees memory for the be_dma_mem cmd(), we can access freed memory when beiscsi_if_clr_ip()/beiscsi_if_set_ip()'s call to beiscsi_exec_nemb_cmd() fails and we access the freed req. This fixes the issue by having the caller free the cmd's memory. Link: https://lore.kernel.org/r/20210701190840.175120-1-michael.christie@oracle.com Reported-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie
Martin K. Petersen
parent
1c0810e79c
commit
7b0ddc1346
1 changed files with 45 additions and 39 deletions
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@ -235,8 +235,7 @@ static int beiscsi_exec_nemb_cmd(struct beiscsi_hba *phba,
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wrb = alloc_mcc_wrb(phba, &tag);
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if (!wrb) {
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mutex_unlock(&ctrl->mbox_lock);
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rc = -ENOMEM;
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goto free_cmd;
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return -ENOMEM;
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}
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sge = nonembedded_sgl(wrb);
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@ -269,24 +268,6 @@ static int beiscsi_exec_nemb_cmd(struct beiscsi_hba *phba,
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/* copy the response, if any */
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if (resp_buf)
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memcpy(resp_buf, nonemb_cmd->va, resp_buf_len);
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/**
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* This is special case of NTWK_GET_IF_INFO where the size of
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* response is not known. beiscsi_if_get_info checks the return
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* value to free DMA buffer.
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*/
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if (rc == -EAGAIN)
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return rc;
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/**
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* If FW is busy that is driver timed out, DMA buffer is saved with
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* the tag, only when the cmd completes this buffer is freed.
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*/
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if (rc == -EBUSY)
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return rc;
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free_cmd:
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dma_free_coherent(&ctrl->pdev->dev, nonemb_cmd->size,
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nonemb_cmd->va, nonemb_cmd->dma);
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return rc;
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}
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@ -309,6 +290,19 @@ static int beiscsi_prep_nemb_cmd(struct beiscsi_hba *phba,
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return 0;
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}
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static void beiscsi_free_nemb_cmd(struct beiscsi_hba *phba,
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struct be_dma_mem *cmd, int rc)
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{
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/*
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* If FW is busy the DMA buffer is saved with the tag. When the cmd
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* completes this buffer is freed.
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*/
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if (rc == -EBUSY)
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return;
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dma_free_coherent(&phba->ctrl.pdev->dev, cmd->size, cmd->va, cmd->dma);
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}
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static void __beiscsi_eq_delay_compl(struct beiscsi_hba *phba, unsigned int tag)
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{
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struct be_dma_mem *tag_mem;
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@ -344,8 +338,16 @@ int beiscsi_modify_eq_delay(struct beiscsi_hba *phba,
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cpu_to_le32(set_eqd[i].delay_multiplier);
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}
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return beiscsi_exec_nemb_cmd(phba, &nonemb_cmd,
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__beiscsi_eq_delay_compl, NULL, 0);
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, __beiscsi_eq_delay_compl,
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NULL, 0);
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if (rc) {
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/*
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* Only free on failure. Async cmds are handled like -EBUSY
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* where it's handled for us.
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*/
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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}
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return rc;
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}
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/**
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@ -372,6 +374,7 @@ int beiscsi_get_initiator_name(struct beiscsi_hba *phba, char *name, bool cfg)
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req->hdr.version = 1;
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL,
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&resp, sizeof(resp));
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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if (rc) {
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beiscsi_log(phba, KERN_ERR,
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BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
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@ -449,7 +452,9 @@ static int beiscsi_if_mod_gw(struct beiscsi_hba *phba,
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req->ip_addr.ip_type = ip_type;
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memcpy(req->ip_addr.addr, gw,
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(ip_type < BEISCSI_IP_TYPE_V6) ? IP_V4_LEN : IP_V6_LEN);
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return beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, NULL, 0);
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rt_val = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, NULL, 0);
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rt_val);
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return rt_val;
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}
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int beiscsi_if_set_gw(struct beiscsi_hba *phba, u32 ip_type, u8 *gw)
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@ -499,8 +504,10 @@ int beiscsi_if_get_gw(struct beiscsi_hba *phba, u32 ip_type,
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req = nonemb_cmd.va;
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req->ip_type = ip_type;
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return beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL,
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resp, sizeof(*resp));
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, resp,
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sizeof(*resp));
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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return rc;
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}
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static int
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@ -537,6 +544,7 @@ beiscsi_if_clr_ip(struct beiscsi_hba *phba,
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"BG_%d : failed to clear IP: rc %d status %d\n",
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rc, req->ip_params.ip_record.status);
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}
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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return rc;
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}
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@ -581,6 +589,7 @@ beiscsi_if_set_ip(struct beiscsi_hba *phba, u8 *ip,
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if (req->ip_params.ip_record.status)
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rc = -EINVAL;
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}
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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return rc;
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}
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@ -608,6 +617,7 @@ int beiscsi_if_en_static(struct beiscsi_hba *phba, u32 ip_type,
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reldhcp->interface_hndl = phba->interface_handle;
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reldhcp->ip_type = ip_type;
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, NULL, 0);
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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if (rc < 0) {
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beiscsi_log(phba, KERN_WARNING, BEISCSI_LOG_CONFIG,
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"BG_%d : failed to release existing DHCP: %d\n",
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@ -689,7 +699,7 @@ int beiscsi_if_en_dhcp(struct beiscsi_hba *phba, u32 ip_type)
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dhcpreq->interface_hndl = phba->interface_handle;
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dhcpreq->ip_type = ip_type;
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, NULL, 0);
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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exit:
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kfree(if_info);
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return rc;
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@ -762,11 +772,8 @@ int beiscsi_if_get_info(struct beiscsi_hba *phba, int ip_type,
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BEISCSI_LOG_INIT | BEISCSI_LOG_CONFIG,
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"BG_%d : Memory Allocation Failure\n");
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/* Free the DMA memory for the IOCTL issuing */
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dma_free_coherent(&phba->ctrl.pdev->dev,
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nonemb_cmd.size,
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nonemb_cmd.va,
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nonemb_cmd.dma);
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd,
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-ENOMEM);
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return -ENOMEM;
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}
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@ -781,15 +788,13 @@ int beiscsi_if_get_info(struct beiscsi_hba *phba, int ip_type,
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nonemb_cmd.va)->actual_resp_len;
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ioctl_size += sizeof(struct be_cmd_req_hdr);
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/* Free the previous allocated DMA memory */
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dma_free_coherent(&phba->ctrl.pdev->dev, nonemb_cmd.size,
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nonemb_cmd.va,
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nonemb_cmd.dma);
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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/* Free the virtual memory */
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kfree(*if_info);
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} else
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} else {
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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break;
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}
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} while (true);
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return rc;
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}
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@ -806,8 +811,9 @@ int mgmt_get_nic_conf(struct beiscsi_hba *phba,
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if (rc)
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return rc;
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return beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL,
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nic, sizeof(*nic));
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rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, nic, sizeof(*nic));
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beiscsi_free_nemb_cmd(phba, &nonemb_cmd, rc);
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return rc;
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}
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static void beiscsi_boot_process_compl(struct beiscsi_hba *phba,
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