From: Andrea Claudi <aclaudi@redhat.com> stable inclusion from stable-5.10.71 commit 12cbdaeeb5d4dfde7a8c2f9eed93bcfa4f4653cd bugzilla: 182981 https://gitee.com/openeuler/kernel/issues/I4I3KD Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 69e73dbfda14fbfe748d3812da1244cce2928dcb ] ip_vs_conn_tab_bits may be provided by the user through the conn_tab_bits module parameter. If this value is greater than 31, or less than 0, the shift operator used to derive tab_size causes undefined behaviour. Fix this checking ip_vs_conn_tab_bits value to be in the range specified in ipvs Kconfig. If not, simply use default value. Fixes: 6f7edb4881bf ("IPVS: Allow boot time change of hash size") Reported-by: Yi Chen <yiche@redhat.com> Signed-off-by: Andrea Claudi <aclaudi@redhat.com> Acked-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- net/netfilter/ipvs/ip_vs_conn.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c index c100c6b112c8..2c467c422dc6 100644 --- a/net/netfilter/ipvs/ip_vs_conn.c +++ b/net/netfilter/ipvs/ip_vs_conn.c @@ -1468,6 +1468,10 @@ int __init ip_vs_conn_init(void) int idx; /* Compute size and mask */ + if (ip_vs_conn_tab_bits < 8 || ip_vs_conn_tab_bits > 20) { + pr_info("conn_tab_bits not in [8, 20]. Using default value\n"); + ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS; + } ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; -- 2.20.1