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netfilter: nft_meta: fix lack of validation of the input register

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We have to validate that the input register is in the range of
allowed registers, otherwise we can take a incorrect register
value as input that may lead us to a crash.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2014-01-09 20:03:55 +01:00
parent c4ede3d382
commit b38895c577
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nft_meta.c
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@ -239,6 +239,9 @@ static int nft_meta_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
return err;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
err = nft_validate_input_register(priv->sreg);
if (err < 0)
return err;
return 0;
}