Re: [PATCH][next] netfilter: nf_tables: Fix dereference of null pointer flow

On Thu, Jun 24, 2021 at 08:57:18PM +0100, Colin King wrote:

From: Colin Ian King <redacted>

In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then
nft_flow_rule_create is not called and flow is NULL. The subsequent
error handling execution via label err_destroy_flow_rule will lead
to a null pointer dereference on flow when calling nft_flow_rule_destroy.
Since the error path to err_destroy_flow_rule has to cater for null
and non-null flows, only call nft_flow_rule_destroy if flow is non-null
to fix this issue.

Applied, thanks.