From: Dan Carpenter Date: Mon, 4 Oct 2010 02:28:36 +0000 (+0000) Subject: cls_u32: signedness bug X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4e18b3edf71f5d4ad653e3c2ff6560878e965f96;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git cls_u32: signedness bug skb_headroom() is unsigned so "skb_headroom(skb) + toff" is also unsigned and can't be less than zero. This test was added in 66d50d25: "u32: negative offset fix" It was supposed to fix a regression. Signed-off-by: Dan Carpenter Signed-off-by: David S. Miller --- diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 7416a5c73b2..b0c2a82178a 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -137,7 +137,7 @@ next_knode: int toff = off + key->off + (off2 & key->offmask); __be32 *data, _data; - if (skb_headroom(skb) + toff < 0) + if (skb_headroom(skb) + toff > INT_MAX) goto out; data = skb_header_pointer(skb, toff, 4, &_data);