diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2012-03-01 11:02:08 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-03-06 00:23:15 +0400 |
| commit | 41eedf39dfb145fb8fa04cd5b799f7bdc7679696 (patch) | |
| tree | 359897e247fc8112046abae3540759eea33213e2 | |
| parent | 5533513784a88049e19dd2ab380a452b61e5171e (diff) | |
| download | linux-41eedf39dfb145fb8fa04cd5b799f7bdc7679696.tar.xz | |
rndis_wlan: integer overflows in rndis_wlan_do_link_up_work()
If "offset" is negative then we can get past this check:
if (offset > CONTROL_BUFFER_SIZE)
Or if we pick a very high "req_ie_len" then we can get around the check:
if (offset + req_ie_len > CONTROL_BUFFER_SIZE)
I made "resp_ie_len" and "req_ie_len" unsigned. I don't know if it was
intentional that they were signed in the original.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/rndis_wlan.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c index a330c69583d6..dde45effef14 100644 --- a/drivers/net/wireless/rndis_wlan.c +++ b/drivers/net/wireless/rndis_wlan.c @@ -2755,9 +2755,10 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev) struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev); struct ndis_80211_assoc_info *info = NULL; u8 bssid[ETH_ALEN]; - int resp_ie_len, req_ie_len; + unsigned int resp_ie_len, req_ie_len; + unsigned int offset; u8 *req_ie, *resp_ie; - int ret, offset; + int ret; bool roamed = false; bool match_bss; @@ -2785,7 +2786,9 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev) ret = get_association_info(usbdev, info, CONTROL_BUFFER_SIZE); if (!ret) { req_ie_len = le32_to_cpu(info->req_ie_length); - if (req_ie_len > 0) { + if (req_ie_len > CONTROL_BUFFER_SIZE) + req_ie_len = CONTROL_BUFFER_SIZE; + if (req_ie_len != 0) { offset = le32_to_cpu(info->offset_req_ies); if (offset > CONTROL_BUFFER_SIZE) @@ -2799,7 +2802,9 @@ static void rndis_wlan_do_link_up_work(struct usbnet *usbdev) } resp_ie_len = le32_to_cpu(info->resp_ie_length); - if (resp_ie_len > 0) { + if (resp_ie_len > CONTROL_BUFFER_SIZE) + resp_ie_len = CONTROL_BUFFER_SIZE; + if (resp_ie_len != 0) { offset = le32_to_cpu(info->offset_resp_ies); if (offset > CONTROL_BUFFER_SIZE) |