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rtlwifi: Detect misread of end-point count 

In the unlikely event of a misread of the USB end point count, the driver
generates a divide fault. To prevent this, add a check of the value
returned by _rtl_usb_init(). In addition, add some logging to indicate
why the condition occurred.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Larry Finger 2012-03-02 13:21:22 -06:00 committed by John W. Linville
parent 3abead59fc
commit 48de1a17fc
1 changed files with 10 additions and 3 deletions
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13
drivers/net/wireless/rtlwifi/usb.c
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@ -346,9 +346,14 @@ static int _rtl_usb_init(struct ieee80211_hw *hw)
pep_desc->bEndpointAddress, pep_desc->wMaxPacketSize,
pep_desc->bInterval);
}
if (rtlusb->in_ep_nums < rtlpriv->cfg->usb_interface_cfg->in_ep_num)
return -EINVAL ;
if (rtlusb->in_ep_nums < rtlpriv->cfg->usb_interface_cfg->in_ep_num) {
pr_err("Too few input end points found\n");
return -EINVAL;
}
if (rtlusb->out_ep_nums == 0) {
pr_err("No output end points found\n");
return -EINVAL;
}
/* usb endpoint mapping */
err = rtlpriv->cfg->usb_interface_cfg->usb_endpoint_mapping(hw);
rtlusb->usb_mq_to_hwq = rtlpriv->cfg->usb_interface_cfg->usb_mq_to_hwq;
@ -976,6 +981,8 @@ int __devinit rtl_usb_probe(struct usb_interface *intf,
}
rtlpriv->cfg->ops->init_sw_leds(hw);
err = _rtl_usb_init(hw);
if (err)
goto error_out;
err = _rtl_usb_init_sw(hw);
/* Init mac80211 sw */
err = rtl_init_core(hw);