[PATCH 4.19 416/422] usb: usbtmc: uninitialized symbol actual in usbtmc_ioctl_clear
From: Greg Kroah-Hartman
Date: Tue Nov 19 2019 - 00:43:07 EST
From: Guido Kiener <guido.kiener@xxxxxxxxxxxxxxxxx>
[ Upstream commit 9a83190300867fb024d53f47c31088e34188efc1 ]
Fix uninitialized symbol 'actual' in function usbtmc_ioctl_clear.
When symbol 'actual' is not initialized and usb_bulk_msg() fails,
the subsequent kernel debug message shows a random value.
Signed-off-by: Guido Kiener <guido.kiener@xxxxxxxxxxxxxxxxx>
Fixes: dfee02ac4bce ("usb: usbtmc: Fix ioctl USBTMC_IOCTL_CLEAR")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/usb/class/usbtmc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 3ce45c9e9d20d..e6a7c86b70f25 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -1016,6 +1016,7 @@ usbtmc_clear_check_status:
do {
dev_dbg(dev, "Reading from bulk in EP\n");
+ actual = 0;
rv = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
data->bulk_in),
--
2.20.1