diff options
| author | John W. Linville <linville@tuxdriver.com> | 2007-11-02 03:13:03 +0100 |
|---|---|---|
| committer | Adrian Bunk <bunk@kernel.org> | 2007-11-02 03:13:03 +0100 |
| commit | c515d9db76c3fe82243677ecfbff559d05f9e852 (patch) | |
| tree | de186ec1cb7aa24a42c0ff85b3da3c09ba820959 | |
| parent | d33e2f267f57e415d8d3fdca375652eb5767e908 (diff) | |
[IEEE80211]: avoid integer underflow for runt rx frames (CVE-2007-4997)
Reported by Chris Evans <scarybeasts@gmail.com>:
> The summary is that an evil 80211 frame can crash out a victim's
> machine. It only applies to drivers using the 80211 wireless code, and
> only then to certain drivers (and even then depends on a card's
> firmware not dropping a dubious packet). I must confess I'm not
> keeping track of Linux wireless support, and the different protocol
> stacks etc.
>
> Details are as follows:
>
> ieee80211_rx() does not explicitly check that "skb->len >= hdrlen".
> There are other skb->len checks, but not enough to prevent a subtle
> off-by-two error if the frame has the IEEE80211_STYPE_QOS_DATA flag
> set.
>
> This leads to integer underflow and crash here:
>
> if (frag != 0)
> flen -= hdrlen;
>
> (flen is subsequently used as a memcpy length parameter).
How about this?
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
| -rw-r--r-- | net/ieee80211/ieee80211_rx.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c index 7ac6a7165d9c..5bc14e2c696f 100644 --- a/net/ieee80211/ieee80211_rx.c +++ b/net/ieee80211/ieee80211_rx.c @@ -367,6 +367,12 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, frag = WLAN_GET_SEQ_FRAG(sc); hdrlen = ieee80211_get_hdrlen(fc); + if (skb->len < hdrlen) { + printk(KERN_INFO "%s: invalid SKB length %d\n", + dev->name, skb->len); + goto rx_dropped; + } + /* Put this code here so that we avoid duplicating it in all * Rx paths. - Jean II */ #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ |