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Date: Tue, 23 Mar 2010 09:34:09 +0800 From: wzt wzt <wzt.wzt@...il.com> To: Patrick McHardy <kaber@...sh.net> Cc: linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org Subject: Re: [PATCH] Netfilter: Fix integer overflow in net/ipv6/netfilter/ip6_tables.c > I can see that the size might cause an overflow in the addition with > sizeof(struct ipt_get_entries) That's the integer overflow i pointed. get.size is copy from the user space, it can be set as 0x7fffffff, addition with sizeof(struct ipt_get_entries) can be overflow. if (*len != sizeof(struct ipt_get_entries) + get.size) { duprintf("get_entries: %u != %zu\n", *len, sizeof(get) + get.size); return -EINVAL; } so, check get.size max value before addition with sizeof(struct ipt_get_entries) to prevent the integer overflow. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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