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rsi: fix memory leak on buf and usb_reg_buf

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In the cases where len is too long, the error return path fails to
kfree allocated buffers buf and usb_reg_buf.  The simplest fix is to
perform the sanity check on len before the allocations to avoid having
to do the kfree'ing in the first place.

Detected by CoverityScan, CID#1452258,1452259 ("Resource Leak")

Fixes: 59f73e2ae1 ("rsi: check length before USB read/write register")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2017-11-16 17:39:18 +00:00 committed by David S. Miller
parent 17e4857775
commit d35ef8f846
1 changed files with 6 additions and 6 deletions
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12
drivers/net/wireless/rsi/rsi_91x_usb.c
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@ -162,13 +162,13 @@ static int rsi_usb_reg_read(struct usb_device *usbdev,
u8 *buf;
int status = -ENOMEM;
if (len > RSI_USB_CTRL_BUF_SIZE)
return -EINVAL;
buf = kmalloc(RSI_USB_CTRL_BUF_SIZE, GFP_KERNEL);
if (!buf)
return status;
if (len > RSI_USB_CTRL_BUF_SIZE)
return -EINVAL;
status = usb_control_msg(usbdev,
usb_rcvctrlpipe(usbdev, 0),
USB_VENDOR_REGISTER_READ,
@ -207,13 +207,13 @@ static int rsi_usb_reg_write(struct usb_device *usbdev,
u8 *usb_reg_buf;
int status = -ENOMEM;
if (len > RSI_USB_CTRL_BUF_SIZE)
return -EINVAL;
usb_reg_buf = kmalloc(RSI_USB_CTRL_BUF_SIZE, GFP_KERNEL);
if (!usb_reg_buf)
return status;
if (len > RSI_USB_CTRL_BUF_SIZE)
return -EINVAL;
usb_reg_buf[0] = (value & 0x00ff);
usb_reg_buf[1] = (value & 0xff00) >> 8;
usb_reg_buf[2] = 0x0;