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Subject[PATCH 3/4] HID: logitech-hidpp: add boundary check for name retrieval
Date
The HID response has a limited size. Do not trust the value returned by
hardware, check that it really fits in the message.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>
---
drivers/hid/hid-logitech-hidpp.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 4d72c20..4292cc3 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -313,6 +313,9 @@ static char *hidpp_get_unifying_name(struct hidpp_device *hidpp_dev)

len = response.rap.params[1];

+ if (2 + len > sizeof(response.rap.params))
+ return NULL;
+
name = kzalloc(len + 1, GFP_KERNEL);
if (!name)
return NULL;
--
2.1.3


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