diff options
Diffstat (limited to 'lib/nlattr.c')
| -rw-r--r-- | lib/nlattr.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c index 2f8feff669a7..5670e4b7dfef 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -95,6 +95,64 @@ static int nla_validate_array(const struct nlattr *head, int len, int maxtype, return 0; } +static int nla_validate_int_range(const struct nla_policy *pt, + const struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + bool validate_min, validate_max; + s64 value; + + validate_min = pt->validation_type == NLA_VALIDATE_RANGE || + pt->validation_type == NLA_VALIDATE_MIN; + validate_max = pt->validation_type == NLA_VALIDATE_RANGE || + pt->validation_type == NLA_VALIDATE_MAX; + + switch (pt->type) { + case NLA_U8: + value = nla_get_u8(nla); + break; + case NLA_U16: + value = nla_get_u16(nla); + break; + case NLA_U32: + value = nla_get_u32(nla); + break; + case NLA_S8: + value = nla_get_s8(nla); + break; + case NLA_S16: + value = nla_get_s16(nla); + break; + case NLA_S32: + value = nla_get_s32(nla); + break; + case NLA_S64: + value = nla_get_s64(nla); + break; + case NLA_U64: + /* treat this one specially, since it may not fit into s64 */ + if ((validate_min && nla_get_u64(nla) < pt->min) || + (validate_max && nla_get_u64(nla) > pt->max)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "integer out of range"); + return -ERANGE; + } + return 0; + default: + WARN_ON(1); + return -EINVAL; + } + + if ((validate_min && value < pt->min) || + (validate_max && value > pt->max)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "integer out of range"); + return -ERANGE; + } + + return 0; +} + static int validate_nla(const struct nlattr *nla, int maxtype, const struct nla_policy *policy, struct netlink_ext_ack *extack) @@ -230,6 +288,20 @@ static int validate_nla(const struct nlattr *nla, int maxtype, goto out_err; } + /* further validation */ + switch (pt->validation_type) { + case NLA_VALIDATE_NONE: + /* nothing to do */ + break; + case NLA_VALIDATE_RANGE: + case NLA_VALIDATE_MIN: + case NLA_VALIDATE_MAX: + err = nla_validate_int_range(pt, nla, extack); + if (err) + return err; + break; + } + return 0; out_err: NL_SET_ERR_MSG_ATTR(extack, nla, "Attribute failed policy validation"); |