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netfilter: nft_hash: fix hash overflow validation

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The overflow validation in the init() function establishes that the
maximum value that the hash could reach is less than U32_MAX, which is
likely to be true.

The fix detects the overflow when the maximum hash value is less than
the offset itself.

Fixes: 70ca767ea1 ("netfilter: nft_hash: Add hash offset value")
Reported-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Laura Garcia Liebana 2016-09-13 10:21:46 +02:00 committed by Pablo Neira Ayuso
parent 2e917d602a
commit 14e2dee099
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nft_hash.c
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@ -76,7 +76,7 @@ static int nft_hash_init(const struct nft_ctx *ctx,
if (priv->modulus <= 1)
return -ERANGE;
if (priv->offset + priv->modulus - 1 < U32_MAX)
if (priv->offset + priv->modulus - 1 < priv->offset)
return -EOVERFLOW;
priv->seed = ntohl(nla_get_be32(tb[NFTA_HASH_SEED]));