[PATCH 6.1 037/150] sfc: fix a double-free bug in efx_probe_filters

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhipeng Lu <alexious@xxxxxxxxxx>

[ Upstream commit d5a306aedba34e640b11d7026dbbafb78ee3a5f6 ]

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:

ef100_net_open
  |-> efx_probe_filters
  |-> 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")
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Reviewed-by: Edward Cree <ecree.xilinx@xxxxxxxxx>
Signed-off-by: Zhipeng Lu <alexious@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231225112915.3544581-1-alexious@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 9220afeddee81..3f290791df1c4 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -820,8 +820,10 @@ 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;
-- 
2.43.0







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