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netfilter: flowtable_offload: add missing locking 

nf_flow_table_block_setup and the driver TC_SETUP_FT call can modify the flow
block cb list while they are being traversed elsewhere, causing a crash.
Add a write lock around the calls to protect readers

Fixes: c29f74e0df ("netfilter: nf_flow_table: hardware offload support")
Reported-by: Chad Monroe <chad.monroe@smartrg.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Felix Fietkau 2022-11-21 19:26:15 +01:00 committed by Pablo Neira Ayuso
parent 6a66ce44a5
commit bcd9e3c165
1 changed files with 4 additions and 0 deletions
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4
net/netfilter/nf_flow_table_offload.c
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@ -1098,6 +1098,7 @@ static int nf_flow_table_block_setup(struct nf_flowtable *flowtable,
struct flow_block_cb *block_cb, *next;
int err = 0;
down_write(&flowtable->flow_block_lock);
switch (cmd) {
case FLOW_BLOCK_BIND:
list_splice(&bo->cb_list, &flowtable->flow_block.cb_list);
@ -1112,6 +1113,7 @@ static int nf_flow_table_block_setup(struct nf_flowtable *flowtable,
WARN_ON_ONCE(1);
err = -EOPNOTSUPP;
}
up_write(&flowtable->flow_block_lock);
return err;
}
@ -1168,7 +1170,9 @@ static int nf_flow_table_offload_cmd(struct flow_block_offload *bo,
nf_flow_table_block_offload_init(bo, dev_net(dev), cmd, flowtable,
extack);
down_write(&flowtable->flow_block_lock);
err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_FT, bo);
up_write(&flowtable->flow_block_lock);
if (err < 0)
return err;