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netfilter: xt_hashlimit: use _ALL macro to reject unknown flag bits

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David Miller says:
     The canonical way to validate if the set bits are in a valid
     range is to have a "_ALL" macro, and test:
     if (val & ~XT_HASHLIMIT_ALL)
         goto err;"

make it so.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2012-05-10 22:11:54 +00:00 committed by Pablo Neira Ayuso
parent 6d8823db42
commit 1f27e2516c
2 changed files with 6 additions and 4 deletions
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8
include/linux/netfilter/xt_hashlimit.h
View File

@ -22,10 +22,12 @@ enum {
XT_HASHLIMIT_HASH_SPT = 1 << 3,
XT_HASHLIMIT_INVERT = 1 << 4,
XT_HASHLIMIT_BYTES = 1 << 5,
#ifdef __KERNEL__
XT_HASHLIMIT_MAX = 1 << 6,
#endif
};
#ifdef __KERNEL__
#define XT_HASHLIMIT_ALL (XT_HASHLIMIT_HASH_DIP | XT_HASHLIMIT_HASH_DPT | \
XT_HASHLIMIT_HASH_SIP | XT_HASHLIMIT_HASH_SPT | \
XT_HASHLIMIT_INVERT | XT_HASHLIMIT_BYTES)
#endif
struct hashlimit_cfg {
__u32 mode; /* bitmask of XT_HASHLIMIT_HASH_* */

2
net/netfilter/xt_hashlimit.c
View File

@ -647,7 +647,7 @@ static int hashlimit_mt_check(const struct xt_mtchk_param *par)
return -EINVAL;
}
if (info->cfg.mode >= XT_HASHLIMIT_MAX) {
if (info->cfg.mode & ~XT_HASHLIMIT_ALL) {
pr_info("Unknown mode mask %X, kernel too old?\n",
info->cfg.mode);
return -EINVAL;