4.20-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit fa89a4593b927b3f59c3b69379f31d3b22272e4e ]
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@xxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ipv6/xfrm6_tunnel.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c
index 4a46df8441c9..f5b4febeaa25 100644
--- a/net/ipv6/xfrm6_tunnel.c
+++ b/net/ipv6/xfrm6_tunnel.c
@@ -144,6 +144,9 @@ static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
index = __xfrm6_tunnel_spi_check(net, spi);
if (index >= 0)
goto alloc_spi;
+
+ if (spi == XFRM6_TUNNEL_SPI_MAX)
+ break;
}
for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
index = __xfrm6_tunnel_spi_check(net, spi);
--
2.19.1
