Messages in this thread Patch in this message | | | From | Peter Wu <> | Subject | [PATCH 2/4] HID: logitech-hidpp: check name retrieval return code | Date | Thu, 11 Dec 2014 13:51:18 +0100 |
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hidpp_devicenametype_get_device_name() may return a negative value on protocol errors (for example, when the device is powered off). Explicitly check this condition to avoid a long-running loop.
(0 cannot be returned as __name_length - index > 0, but check for it anyway as it would otherwise result in an infinite loop.)
Signed-off-by: Peter Wu <peter@lekensteyn.nl> --- drivers/hid/hid-logitech-hidpp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 5066df8..4d72c20 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -484,10 +484,16 @@ static char *hidpp_get_device_name(struct hidpp_device *hidpp) if (!name) return NULL; - while (index < __name_length) - index += hidpp_devicenametype_get_device_name(hidpp, + while (index < __name_length) { + ret = hidpp_devicenametype_get_device_name(hidpp, feature_index, index, name + index, __name_length - index); + if (ret <= 0) { + kfree(name); + return NULL; + } + index += ret; + } return name; } -- 2.1.3
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