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sfc: fix error unwinds in TC offload

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Failure ladders weren't exactly unwinding what the function had done up
 to that point; most seriously, when we encountered an already offloaded
 rule, the failure path tried to remove the new rule from the hashtable,
 which would in fact remove the already-present 'old' rule (since it has
 the same key) from the table, and leak its resources.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202305200745.xmIlkqjH-lkp@intel.com/
Fixes: d902e1a737 ("sfc: bare bones TC offload on EF100")
Fixes: 17654d84b4 ("sfc: add offloading of 'foreign' TC (decap) rules")
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230530202527.53115-1-edward.cree@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Edward Cree 2023-05-30 21:25:27 +01:00 committed by Jakub Kicinski
parent 448a5ce112
commit 622ab65634
1 changed files with 12 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/net/ethernet/sfc/tc.c
View File

@ -624,13 +624,12 @@ static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
if (!found) { /* We don't care. */
netif_dbg(efx, drv, efx->net_dev,
"Ignoring foreign filter that doesn't egdev us\n");
rc = -EOPNOTSUPP;
goto release;
return -EOPNOTSUPP;
}
rc = efx_mae_match_check_caps(efx, &match.mask, NULL);
if (rc)
goto release;
return rc;
if (efx_tc_match_is_encap(&match.mask)) {
enum efx_encap_type type;
@ -639,8 +638,7 @@ static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
if (type == EFX_ENCAP_TYPE_NONE) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match on unsupported tunnel device");
rc = -EOPNOTSUPP;
goto release;
return -EOPNOTSUPP;
}
rc = efx_mae_check_encap_type_supported(efx, type);
@ -648,25 +646,24 @@ static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
NL_SET_ERR_MSG_FMT_MOD(extack,
"Firmware reports no support for %s encap match",
efx_tc_encap_type_name(type));
goto release;
return rc;
}
rc = efx_tc_flower_record_encap_match(efx, &match, type,
extack);
if (rc)
goto release;
return rc;
} else {
/* This is not a tunnel decap rule, ignore it */
netif_dbg(efx, drv, efx->net_dev,
"Ignoring foreign filter without encap match\n");
rc = -EOPNOTSUPP;
goto release;
return -EOPNOTSUPP;
}
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule) {
rc = -ENOMEM;
goto release;
goto out_free;
}
INIT_LIST_HEAD(&rule->acts.list);
rule->cookie = tc->cookie;
@ -678,7 +675,7 @@ static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
"Ignoring already-offloaded rule (cookie %lx)\n",
tc->cookie);
rc = -EEXIST;
goto release;
goto out_free;
}
act = kzalloc(sizeof(*act), GFP_USER);
@ -843,6 +840,7 @@ release:
efx_tc_match_action_ht_params);
efx_tc_free_action_set_list(efx, &rule->acts, false);
}
out_free:
kfree(rule);
if (match.encap)
efx_tc_flower_release_encap_match(efx, match.encap);
@ -899,8 +897,7 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
return rc;
if (efx_tc_match_is_encap(&match.mask)) {
NL_SET_ERR_MSG_MOD(extack, "Ingress enc_key matches not supported");
rc = -EOPNOTSUPP;
goto release;
return -EOPNOTSUPP;
}
if (tc->common.chain_index) {
@ -924,9 +921,9 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Already offloaded rule (cookie %lx)\n", tc->cookie);
rc = -EEXIST;
NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
goto release;
kfree(rule);
return -EEXIST;
}
/* Parse actions */