diff options
Diffstat (limited to 'src/expect/parse_mnl.c')
| -rw-r--r-- | src/expect/parse_mnl.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/src/expect/parse_mnl.c b/src/expect/parse_mnl.c index 091a8ae..fb4bdb7 100644 --- a/src/expect/parse_mnl.c +++ b/src/expect/parse_mnl.c @@ -10,6 +10,7 @@ */ #include "internal/internal.h" +#include <assert.h> #include <libmnl/libmnl.h> static int nlmsg_parse_expection_attr_cb(const struct nlattr *attr, void *data) @@ -139,10 +140,8 @@ int nfexp_nlmsg_parse(const struct nlmsghdr *nlh, struct nf_expect *exp) set_bit(ATTR_EXP_FLAGS, exp->set); } if (tb[CTA_EXPECT_HELP_NAME]) { - strncpy(exp->helper_name, - mnl_attr_get_str(tb[CTA_EXPECT_HELP_NAME]), - NFCT_HELPER_NAME_MAX); - exp->helper_name[NFCT_HELPER_NAME_MAX - 1] = '\0'; + snprintf(exp->helper_name, NFCT_HELPER_NAME_MAX, "%s", + mnl_attr_get_str(tb[CTA_EXPECT_HELP_NAME])); set_bit(ATTR_EXP_HELPER_NAME, exp->set); } if (tb[CTA_EXPECT_CLASS]) { @@ -153,9 +152,11 @@ int nfexp_nlmsg_parse(const struct nlmsghdr *nlh, struct nf_expect *exp) nfexp_nlmsg_parse_nat(nfg, tb[CTA_EXPECT_NAT], exp); if (tb[CTA_EXPECT_FN]) { - strncpy(exp->expectfn, mnl_attr_get_payload(tb[CTA_EXPECT_FN]), - __NFCT_EXPECTFN_MAX); - exp->expectfn[__NFCT_EXPECTFN_MAX - 1] = '\0'; + int len = mnl_attr_get_payload_len(tb[CTA_EXPECT_FN]); + /* the kernel doesn't impose a max length on this str */ + assert(len <= __NFCT_EXPECTFN_MAX); + snprintf(exp->expectfn, __NFCT_EXPECTFN_MAX, "%s", + (char *)mnl_attr_get_payload(tb[CTA_EXPECT_FN])); set_bit(ATTR_EXP_FN, exp->set); } |