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Code Issues Releases Wiki Activity

netfilter: nf_tables: bail out on mismatching dynset and set expressions 

If dynset expressions provided by userspace is larger than the declared
set expressions, then bail out.

Fixes: 48b0ae046e ("netfilter: nftables: netlink support for several set element expressions")
Reported-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2023-12-04 14:25:33 +01:00
parent 63331e37fb
commit 3701cd390f
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/netfilter/nft_dynset.c
View File

@ -280,10 +280,15 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
priv->expr_array[i] = dynset_expr;
priv->num_exprs++;
if (set->num_exprs &&
dynset_expr->ops != set->exprs[i]->ops) {
err = -EOPNOTSUPP;
goto err_expr_free;
if (set->num_exprs) {
if (i >= set->num_exprs) {
err = -EINVAL;
goto err_expr_free;
}
if (dynset_expr->ops != set->exprs[i]->ops) {
err = -EOPNOTSUPP;
goto err_expr_free;
}
}
i++;
}