6.6-stable review patch. If anyone has any objections, please let me know.
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From: Zhipeng Lu alexious@zju.edu.cn
[ 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@kernel.org Reviewed-by: Edward Cree ecree.xilinx@gmail.com Signed-off-by: Zhipeng Lu alexious@zju.edu.cn Link: https://lore.kernel.org/r/20231225112915.3544581-1-alexious@zju.edu.cn Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 d2f35ee15effe..fac227d372db4 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;