[lvc-project] [PATCH] scsi: hpsa: prevent memory leak in hpsa_big_passthru_ioctl

[Fedor Pchelkin]

In case copy_from_user() fails during the buffers allocating loop inside
hpsa_big_passthru_ioctl(), the last allocated buffer (accessed by sg_used
index) is not freed on cleanup1 error path as sg_used index has not been
incremented yet.

Free the last allocated buffer directly if copy_from_user() fails.

Found by Linux Verification Center (linuxtesting.org).

Fixes: edd163687ea5 ("[SCSI] hpsa: add driver for HP Smart Array controllers.")
Signed-off-by: Fedor Pchelkin <pchelkin at ispras.ru>
---
 drivers/scsi/hpsa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index af18d20f3079..897f9ee3c004 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6536,6 +6536,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h,
 		if (ioc->Request.Type.Direction & XFER_WRITE) {
 			if (copy_from_user(buff[sg_used], data_ptr, sz)) {
 				status = -EFAULT;
+				kfree(buff[sg_used]);
 				goto cleanup1;
 			}
 		} else
-- 
2.43.0