[PATCH 5.15.y] scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak

[Sasha Levin <sashal@kernel.org>]

From: Nilesh Javali <njavali@marvell.com>

[ Upstream commit a152edab3854f01dd2daf3eaf8f32cbabdb3834e ]

qla2x00_do_dport_diagnostics() allocates the qla_dport_diag response
buffer with kmalloc_obj() (non-zeroing) and, on success, copies the full
sizeof(*dd) back to user space via sg_copy_from_buffer(). The inbound
sg_copy_to_buffer() only fills as many bytes as the user request payload
provides, and qla26xx_dport_diagnostics() zeroes only dd->buf. The
options and unused[] fields are therefore copied out uninitialized,
leaking kernel heap contents to user space.

Allocate with kzalloc_obj(), matching qla2x00_do_dport_diagnostics_v2().

Fixes: ec89146215d1 ("qla2xxx: Add bsg interface to support D_Port Diagnostics.")
Cc: stable@vger.kernel.org
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Link: https://patch.msgid.link/20260723050413.3897522-54-njavali@marvell.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
[ Adapted kzalloc_obj(*dd) to kzalloc(sizeof(*dd), GFP_KERNEL) to match the branch’s allocation syntax. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qla2xxx/qla_bsg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_bsg.c b/drivers/scsi/qla2xxx/qla_bsg.c
index 23779a1f0cee9..aadc5d0b6c270 100644
--- a/drivers/scsi/qla2xxx/qla_bsg.c
+++ b/drivers/scsi/qla2xxx/qla_bsg.c
@@ -2393,7 +2393,7 @@ qla2x00_do_dport_diagnostics(struct bsg_job *bsg_job)
 	    !IS_QLA28XX(vha->hw))
 		return -EPERM;
 
-	dd = kmalloc(sizeof(*dd), GFP_KERNEL);
+	dd = kzalloc(sizeof(*dd), GFP_KERNEL);
 	if (!dd) {
 		ql_log(ql_log_warn, vha, 0x70db,
 		    "Failed to allocate memory for dport.\n");
-- 
2.53.0