[PATCH v6 1/5] scsi: mvumi: bound the per-event parameter and sense dumps

[Yehyeong Lee <yhlee@isslab.korea.ac.kr>]

mvumi_show_event() prints param_count u32 words from params[] and
sense_data_length bytes from sense_data[], but both counts come from the
firmware event (struct mvumi_driver_event) and are never checked against
the arrays, which hold four words and 30 bytes.  A firmware that reports
the maximum (255 each) makes the loops read far past the event and past
the 512-byte buffer the event block is allocated in, printing the result
to the kernel log.

Stop each loop at the size of its array.

Fixes: f0c568a478f0 ("[SCSI] mvumi: Add Marvell UMI driver")
Cc: stable@vger.kernel.org
Signed-off-by: Yehyeong Lee <yhlee@isslab.korea.ac.kr>
---
 drivers/scsi/mvumi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index e70d336b4ab39..38a92f8c25f5b 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -1361,7 +1361,8 @@ static void mvumi_show_event(struct mvumi_hba *mhba,
 	if (ptr->param_count) {
 		printk(KERN_WARNING "Event param(len 0x%x): ",
 						ptr->param_count);
-		for (i = 0; i < ptr->param_count; i++)
+		for (i = 0; i < ptr->param_count &&
+		     i < ARRAY_SIZE(ptr->params); i++)
 			printk(KERN_WARNING "0x%x ", ptr->params[i]);
 
 		printk(KERN_WARNING "\n");
@@ -1370,7 +1371,8 @@ static void mvumi_show_event(struct mvumi_hba *mhba,
 	if (ptr->sense_data_length) {
 		printk(KERN_WARNING "Event sense data(len 0x%x): ",
 						ptr->sense_data_length);
-		for (i = 0; i < ptr->sense_data_length; i++)
+		for (i = 0; i < ptr->sense_data_length &&
+		     i < sizeof(ptr->sense_data); i++)
 			printk(KERN_WARNING "0x%x ", ptr->sense_data[i]);
 		printk(KERN_WARNING "\n");
 	}
-- 
2.43.0