In the free_cmd error path of callee beiscsi_exec_nemb_cmd(),
nonemb_cmd->va is freed by dma_free_coherent().
As req = nonemb_cmd.va, we can see that the freed nonemb_cmd.va
is still dereferenced and used by req->ip_params.ip_record.status.
My patch uses status to replace req->ip_params.ip_record.status
to avoid the uaf.
Signed-off-by: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
---
drivers/scsi/be2iscsi/be_mgmt.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/be2iscsi/be_mgmt.c b/drivers/scsi/be2iscsi/be_mgmt.c
index 0d4928567265..b93b1a8c6c81 100644
--- a/drivers/scsi/be2iscsi/be_mgmt.c
+++ b/drivers/scsi/be2iscsi/be_mgmt.c
@@ -509,6 +509,7 @@ beiscsi_if_clr_ip(struct beiscsi_hba *phba,
{
struct be_cmd_set_ip_addr_req *req;
struct be_dma_mem nonemb_cmd;
+ u32 status;
int rc;
rc = beiscsi_prep_nemb_cmd(phba, &nonemb_cmd, CMD_SUBSYSTEM_ISCSI,
@@ -531,11 +532,12 @@ beiscsi_if_clr_ip(struct beiscsi_hba *phba,
memcpy(req->ip_params.ip_record.ip_addr.subnet_mask,
if_info->ip_addr.subnet_mask,
sizeof(if_info->ip_addr.subnet_mask));
+ status = req->ip_params.ip_record.status;
rc = beiscsi_exec_nemb_cmd(phba, &nonemb_cmd, NULL, NULL, 0);
- if (rc < 0 || req->ip_params.ip_record.status) {
+ if (rc < 0 || status) {
beiscsi_log(phba, KERN_INFO, BEISCSI_LOG_CONFIG,
"BG_%d : failed to clear IP: rc %d status %d\n",
- rc, req->ip_params.ip_record.status);
+ rc, status);
}
return rc;
}
--
2.25.1
