[22/80] Staging: vt6655: fix buffer overflow

Greg KH
2010-09-24T16:57:51Z

From: Dan Carpenter <error27@gmail.com>

commit dd173abfead903c7df54e977535973f3312cd307 upstream.

"param->u.wpa_associate.wpa_ie_len" comes from the user. We should
check it so that the copy_from_user() doesn't overflow the buffer.

Also further down in the function, we assume that if
"param->u.wpa_associate.wpa_ie_len" is set then "abyWPAIE[0]" is
initialized. To make that work, I changed the test here to say that if
"wpa_ie_len" is set then "wpa_ie" has to be a valid pointer or we return
-EINVAL.

Oddly, we only use the first element of the abyWPAIE[] array. So I
suspect there may be some other issues in this function.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/staging/vt6655/wpactl.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/staging/vt6655/wpactl.c
+++ b/drivers/staging/vt6655/wpactl.c
@@ -766,9 +766,14 @@ static int wpa_set_associate(PSDevice pD
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "wpa_ie_len = %d\n", param->u.wpa_associate.wpa_ie_len);

- if (param->u.wpa_associate.wpa_ie &&
- copy_from_user(&abyWPAIE[0], param->u.wpa_associate.wpa_ie, param->u.wpa_associate.wpa_ie_len))
- return -EINVAL;
+ if (param->u.wpa_associate.wpa_ie_len) {
+ if (!param->u.wpa_associate.wpa_ie)
+ return -EINVAL;
+ if (param->u.wpa_associate.wpa_ie_len > sizeof(abyWPAIE))
+ return -EINVAL;
+ if (copy_from_user(&abyWPAIE[0], param->u.wpa_associate.wpa_ie, param->u.wpa_associate.wpa_ie_len))
+ return -EFAULT;
+ }

if (param->u.wpa_associate.mode == 1)
pMgmt->eConfigMode = WMAC_CONFIG_IBSS_STA;