On Sat, Nov 4, 2017 at 7:13 AM, Eric Dumazet <edumazet@xxxxxxxxxx> wrote:
> On Sat, Nov 4, 2017 at 1:31 AM, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>> Hello Eric Dumazet,
>>
>> The patch 3f27fb23219e: "ipv6: addrconf: add per netns perturbation
>> in inet6_addr_hash()" from Oct 23, 2017, leads to the following
>> static checker warning:
>>
>> net/core/pktgen.c:2169 pktgen_setup_inject()
>> error: buffer overflow 'pkt_dev->cur_in6_saddr.in6_u.u6_addr8' 16 <= 255
>>
>> net/core/pktgen.c
>> 2157 if (pkt_dev->flags & F_IPV6) {
>> 2158 int i, set = 0, err = 1;
>> 2159 struct inet6_dev *idev;
>> 2160
>> 2161 if (pkt_dev->min_pkt_size == 0) {
>> 2162 pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
>> 2163 + sizeof(struct udphdr)
>> 2164 + sizeof(struct pktgen_hdr)
>> 2165 + pkt_dev->pkt_overhead;
>> 2166 }
>> 2167
>> 2168 for (i = 0; i < IN6_ADDR_HSIZE; i++)
>> ^^^^^^^^^^^^^^
>> My guess is that this is the wrong test here, but I don't know for sure.
>>
>> 2169 if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
>> ^^^^^^^^^^
>> This used to work but now that IN6_ADDR_HSIZE is 256 instead of 16 we're
>> reading beyond the end of the array.
>>
>> 2170 set = 1;
>> 2171 break;
>> 2172 }
>> 2173
>> 2174 if (!set) {
>> 2175
>> 2176 /*
>> 2177 * Use linklevel address if unconfigured.
>> 2178 *
>> 2179 * use ipv6_get_lladdr if/when it's get exported
>> 2180 */
>> 2181
>>
>> regards,
>> dan carpenter
>
> pktgen is obviously wrong.
>
> Thanks for the report.
I am travelling to Seoul for netconf/netdev, please send this patch in
an official way.
Thanks !
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 6e1e10ff433a5f4097d1d4b33848ab13d4e005c6..e3fa53a07d34b3e5f6b438e08b440f520b3cd6d4
100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2165,7 +2165,7 @@ static void pktgen_setup_inject(struct
pktgen_dev *pkt_dev)
+ pkt_dev->pkt_overhead;
}
- for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ for (i = 0; i < sizeof(struct in6_addr); i++)
if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
set = 1;
break;
--
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