netfilter: flowtable: initialise extack before use

JIRA: https://issues.redhat.com/browse/RHEL-58544
CVE: CVE-2024-45018

commit e976713
Author: Donald Hunter <[email protected]>
Date:   Tue Aug 6 17:16:37 2024 +0100

    netfilter: flowtable: initialise extack before use

    Fix missing initialisation of extack in flow offload.

    Fixes: c29f74e ("netfilter: nf_flow_table: hardware offload support")
    Signed-off-by: Donald Hunter <[email protected]>
    Reviewed-by: Simon Horman <[email protected]>
    Signed-off-by: Pablo Neira Ayuso <[email protected]>

Signed-off-by: CKI Backport Bot <[email protected]>

Author: CKI Backport Bot

net/netfilter/nf_flow_table_offload.c

@@ -834,8 +834,8 @@ static int nf_flow_offload_tuple(struct nf_flowtable *flowtable,
 				 struct list_head *block_cb_list)
 {
 	struct flow_cls_offload cls_flow = {};
+	struct netlink_ext_ack extack = {};
 	struct flow_block_cb *block_cb;
-	struct netlink_ext_ack extack;
 	__be16 proto = ETH_P_ALL;
 	int err, i = 0;