[PATCH AUTOSEL 5.10 5/7] media: lgdt3306a: Add a check against null-pointer-def
From: Sasha Levin
Date: Mon May 27 2024 - 12:29:12 EST
From: Zheyu Ma <zheyuma97@xxxxxxxxx>
[ Upstream commit c1115ddbda9c930fba0fdd062e7a8873ebaf898d ]
The driver should check whether the client provides the platform_data.
The following log reveals it:
[ 29.610324] BUG: KASAN: null-ptr-deref in kmemdup+0x30/0x40
[ 29.610730] Read of size 40 at addr 0000000000000000 by task bash/414
[ 29.612820] Call Trace:
[ 29.613030] <TASK>
[ 29.613201] dump_stack_lvl+0x56/0x6f
[ 29.613496] ? kmemdup+0x30/0x40
[ 29.613754] print_report.cold+0x494/0x6b7
[ 29.614082] ? kmemdup+0x30/0x40
[ 29.614340] kasan_report+0x8a/0x190
[ 29.614628] ? kmemdup+0x30/0x40
[ 29.614888] kasan_check_range+0x14d/0x1d0
[ 29.615213] memcpy+0x20/0x60
[ 29.615454] kmemdup+0x30/0x40
[ 29.615700] lgdt3306a_probe+0x52/0x310
[ 29.616339] i2c_device_probe+0x951/0xa90
Link: https://lore.kernel.org/linux-media/20220405095018.3993578-1-zheyuma97@xxxxxxxxx
Signed-off-by: Zheyu Ma <zheyuma97@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/media/dvb-frontends/lgdt3306a.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c
index 47fb22180d5b4..d638cc88aa770 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -2213,6 +2213,11 @@ static int lgdt3306a_probe(struct i2c_client *client,
struct dvb_frontend *fe;
int ret;
+ if (!client->dev.platform_data) {
+ dev_err(&client->dev, "platform data is mandatory\n");
+ return -EINVAL;
+ }
+
config = kmemdup(client->dev.platform_data,
sizeof(struct lgdt3306a_config), GFP_KERNEL);
if (config == NULL) {
--
2.43.0