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netfilter: nft_byteorder: track register operations

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Cancel tracking for byteorder operation, otherwise selector + byteorder
operation is incorrectly reduced if source and destination registers are
the same.

Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-01-26 01:46:58 +01:00
parent aeac4554eb
commit f459bfd4b9
1 changed files with 12 additions and 0 deletions
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12
net/netfilter/nft_byteorder.c
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@ -167,12 +167,24 @@ nla_put_failure:
return -1; return -1;
} }
static bool nft_byteorder_reduce(struct nft_regs_track *track,
const struct nft_expr *expr)
{
struct nft_byteorder *priv = nft_expr_priv(expr);
track->regs[priv->dreg].selector = NULL;
track->regs[priv->dreg].bitwise = NULL;
return false;
}
static const struct nft_expr_ops nft_byteorder_ops = { static const struct nft_expr_ops nft_byteorder_ops = {
.type = &nft_byteorder_type, .type = &nft_byteorder_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)), .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)),
.eval = nft_byteorder_eval, .eval = nft_byteorder_eval,
.init = nft_byteorder_init, .init = nft_byteorder_init,
.dump = nft_byteorder_dump, .dump = nft_byteorder_dump,
.reduce = nft_byteorder_reduce,
}; };
struct nft_expr_type nft_byteorder_type __read_mostly = { struct nft_expr_type nft_byteorder_type __read_mostly = {