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* [PATCH] scsi: be2iscsi: Fix a use after free in beiscsi_if_clr_ip
@ 2021-05-24  9:50 Lv Yunlong
  2021-06-29 22:02 ` Martin K. Petersen
  0 siblings, 1 reply; 4+ messages in thread
From: Lv Yunlong @ 2021-05-24  9:50 UTC (permalink / raw)
  To: subbu.seetharaman, ketan.mukadam, jitendra.bhivare, jejb,
	martin.petersen
  Cc: linux-scsi, linux-kernel, Lv Yunlong

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@mail.ustc.edu.cn>
---
 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 462717bbb5b7..f05fcea707cd 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



^ permalink raw reply	[flat|nested] 4+ messages in thread
* [PATCH] scsi: be2iscsi: Fix a use after free in beiscsi_if_clr_ip
@ 2021-04-03  6:40 Lv Yunlong
  0 siblings, 0 replies; 4+ messages in thread
From: Lv Yunlong @ 2021-04-03  6:40 UTC (permalink / raw)
  To: subbu.seetharaman, ketan.mukadam, jitendra.bhivare, jejb,
	martin.petersen
  Cc: linux-scsi, linux-kernel, Lv Yunlong

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@mail.ustc.edu.cn>
---
 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



^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-07-01  1:14 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-24  9:50 [PATCH] scsi: be2iscsi: Fix a use after free in beiscsi_if_clr_ip Lv Yunlong
2021-06-29 22:02 ` Martin K. Petersen
2021-07-01  1:13   ` michael.christie
  -- strict thread matches above, loose matches on Subject: below --
2021-04-03  6:40 Lv Yunlong

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