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Commit 753c111f authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
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netfilter: nft_compat: use-after-free when deleting targets 



Fetch pointer to module before target object is released.

Fixes: 29e38801 ("netfilter: nf_tables: fix use-after-free when deleting compat expressions")
Fixes: 0ca743a5 ("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 098e13f5

net/netfilter/nft_compat.c

+2 −1
Original line number Diff line number Diff line
@@ -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,