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From:   Zhipeng Lu <alexious@zju.edu.cn>
To:     alexious@zju.edu.cn
Cc:     Edward Cree <ecree.xilinx@gmail.com>,
        Martin Habets <habetsm.xilinx@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-net-drivers@amd.com, linux-kernel@vger.kernel.org
Subject: [PATCH] sfc: fix a double-free bug in efx_probe_filters
Date:   Thu, 14 Dec 2023 23:22:46 +0800
Message-Id: <20231214152247.3482788-1-alexious@zju.edu.cn>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

In efx_probe_filters, the channel->rps_flow_id is freed in a
efx_for_each_channel marco  when success equals to 0.
However, after the following call chain:

efx_probe_filters
  |-> ef100_net_open
        |-> ef100_net_stop
              |-> efx_remove_filters

The channel->rps_flow_id is freed again in the efx_for_each_channel of
efx_remove_filters, triggering a double-free bug.

Fixes: a9dc3d5612ce ("sfc_ef100: RX filter table management and related gubbins")
Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
---
 drivers/net/ethernet/sfc/rx_common.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c
index d2f35ee15eff..fac227d372db 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -823,8 +823,10 @@ int efx_probe_filters(struct efx_nic *efx)
 		}
 
 		if (!success) {
-			efx_for_each_channel(channel, efx)
+			efx_for_each_channel(channel, efx) {
 				kfree(channel->rps_flow_id);
+				channel->rps_flow_id = NULL;
+			}
 			efx->type->filter_table_remove(efx);
 			rc = -ENOMEM;
 			goto out_unlock;
-- 
2.34.1