[PATCH 5.6 190/254] scsi: lpfc: Fix lpfc_io_buf resource leak in lpfc_get_scsi_buf_s4 error path

From: Greg Kroah-Hartman
Date: Thu Apr 16 2020 - 10:29:31 EST


From: James Smart <jsmart2021@xxxxxxxxx>

commit 0ab384a49c548baf132ccef249f78d9c6c506380 upstream.

If a call to lpfc_get_cmd_rsp_buf_per_hdwq returns NULL (memory allocation
failure), a previously allocated lpfc_io_buf resource is leaked.

Fix by releasing the lpfc_io_buf resource in the failure path.

Fixes: d79c9e9d4b3d ("scsi: lpfc: Support dynamic unbounded SGL lists on G7 hardware.")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.4+
Link: https://lore.kernel.org/r/20200128002312.16346-3-jsmart2021@xxxxxxxxx
Signed-off-by: Dick Kennedy <dick.kennedy@xxxxxxxxxxxx>
Signed-off-by: James Smart <jsmart2021@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/scsi/lpfc/lpfc_scsi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -671,8 +671,10 @@ lpfc_get_scsi_buf_s4(struct lpfc_hba *ph
lpfc_cmd->prot_data_type = 0;
#endif
tmp = lpfc_get_cmd_rsp_buf_per_hdwq(phba, lpfc_cmd);
- if (!tmp)
+ if (!tmp) {
+ lpfc_release_io_buf(phba, lpfc_cmd, lpfc_cmd->hdwq);
return NULL;
+ }

lpfc_cmd->fcp_cmnd = tmp->fcp_cmnd;
lpfc_cmd->fcp_rsp = tmp->fcp_rsp;