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xfrm6_tunnel: Fix spi check in __xfrm6_tunnel_alloc_spi 

gcc warn this:

net/ipv6/xfrm6_tunnel.c:143 __xfrm6_tunnel_alloc_spi() warn:
 always true condition '(spi <= 4294967295) => (0-u32max <= u32max)'

'spi' is u32, which always not greater than XFRM6_TUNNEL_SPI_MAX
because of wrap around. So the second forloop will never reach.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
YueHaibing 2018-12-19 14:45:09 +08:00 committed by Steffen Klassert
parent cc4acb1b6a
commit fa89a4593b
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/xfrm6_tunnel.c
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@ -144,6 +144,9 @@ static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
index = __xfrm6_tunnel_spi_check(net, spi); index = __xfrm6_tunnel_spi_check(net, spi);
if (index >= 0) if (index >= 0)
goto alloc_spi; goto alloc_spi;
if (spi == XFRM6_TUNNEL_SPI_MAX)
break;
} }
for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) { for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
index = __xfrm6_tunnel_spi_check(net, spi); index = __xfrm6_tunnel_spi_check(net, spi);