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netfilter: ipset: small potential read beyond the end of buffer 

We could be reading 8 bytes into a 4 byte buffer here.  It seems
harmless but adding a check is the right thing to do and it silences a
static checker warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Dan Carpenter 2014-11-10 17:11:21 +01:00 committed by Pablo Neira Ayuso
parent 6b96686ecf
commit 2196937e12
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/ipset/ip_set_core.c
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@ -1863,6 +1863,12 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
if (*op < IP_SET_OP_VERSION) { if (*op < IP_SET_OP_VERSION) {
/* Check the version at the beginning of operations */ /* Check the version at the beginning of operations */
struct ip_set_req_version *req_version = data; struct ip_set_req_version *req_version = data;
if (*len < sizeof(struct ip_set_req_version)) {
ret = -EINVAL;
goto done;
}
if (req_version->version != IPSET_PROTOCOL) { if (req_version->version != IPSET_PROTOCOL) {
ret = -EPROTO; ret = -EPROTO;
goto done; goto done;