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netfilter: nft_compat: use-after-free when deleting targets

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Fetch pointer to module before target object is released.

Fixes: 29e3880109 ("netfilter: nf_tables: fix use-after-free when deleting compat expressions")
Fixes: 0ca743a559 ("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-02-13 13:03:53 +01:00
parent 098e13f5b2
commit 753c111f65
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nft_compat.c
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@ -315,6 +315,7 @@ nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
{
struct xt_target *target = expr->ops->data;
void *info = nft_expr_priv(expr);
struct module *me = target->me;
struct xt_tgdtor_param par;
par.net = ctx->net;
@ -325,7 +326,7 @@ nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
par.target->destroy(&par);
if (nft_xt_put(container_of(expr->ops, struct nft_xt, ops)))
module_put(target->me);
module_put(me);
}
static int nft_extension_dump_info(struct sk_buff *skb, int attr,