From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
[ Upstream commit 3782c0d6edf658b71354a64d60aa7a296188fc90 ]
betopff_init() only checks the total sum of the report counts for each
report field to be at least 4, but hid_betopff_play() expects 4 report
fields.
A device advertising an output report with one field and 4 report counts
would pass the check but crash the kernel with a NULL pointer dereference
in hid_betopff_play().
Fixes: 52cd7785f3cd ("HID: betop: add drivers/hid/hid-betopff.c")
Signed-off-by: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/hid/hid-betopff.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/hid/hid-betopff.c b/drivers/hid/hid-betopff.c
index 467d789f9bc2..25ed7b9a917e 100644
--- a/drivers/hid/hid-betopff.c
+++ b/drivers/hid/hid-betopff.c
@@ -60,7 +60,6 @@ static int betopff_init(struct hid_device *hid)
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct input_dev *dev;
- int field_count = 0;
int error;
int i, j;
@@ -86,19 +85,21 @@ static int betopff_init(struct hid_device *hid)
* -----------------------------------------
* Do init them with default value.
*/
+ if (report->maxfield < 4) {
+ hid_err(hid, "not enough fields in the report: %d\n",
+ report->maxfield);
+ return -ENODEV;
+ }
for (i = 0; i < report->maxfield; i++) {
+ if (report->field[i]->report_count < 1) {
+ hid_err(hid, "no values in the field\n");
+ return -ENODEV;
+ }
for (j = 0; j < report->field[i]->report_count; j++) {
report->field[i]->value[j] = 0x00;
- field_count++;
}
}
- if (field_count < 4) {
- hid_err(hid, "not enough fields in the report: %d\n",
- field_count);
- return -ENODEV;
- }
-
betopff = kzalloc(sizeof(*betopff), GFP_KERNEL);
if (!betopff)
return -ENOMEM;
--
2.39.0
