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net: mlx5: Add a missing check on idr_find, free buf

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[ Upstream commit 8e949363f0 ]

idr_find() can return a NULL value to 'flow' which is used without a
check. The patch adds a check to avoid potential NULL pointer dereference.

In case of mlx5_fpga_sbu_conn_sendmsg() failure, free buf allocated
using kzalloc.

Fixes: ab412e1dd7 ("net/mlx5: Accel, add TLS rx offload routines")
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aditya Pakki
2019-03-19 16:42:40 -05:00
committed by Greg Kroah-Hartman
parent b787544dc5
commit eab86503fe
1 changed files with 11 additions and 3 deletions
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14
drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c
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@@ -217,15 +217,21 @@ int mlx5_fpga_tls_resync_rx(struct mlx5_core_dev *mdev, u32 handle, u32 seq,
void *cmd;
int ret;
rcu_read_lock();
flow = idr_find(&mdev->fpga->tls->rx_idr, ntohl(handle));
rcu_read_unlock();
if (!flow) {
WARN_ONCE(1, "Received NULL pointer for handle\n");
return -EINVAL;
}
buf = kzalloc(size, GFP_ATOMIC);
if (!buf)
return -ENOMEM;
cmd = (buf + 1);
rcu_read_lock();
flow = idr_find(&mdev->fpga->tls->rx_idr, ntohl(handle));
rcu_read_unlock();
mlx5_fpga_tls_flow_to_cmd(flow, cmd);
MLX5_SET(tls_cmd, cmd, swid, ntohl(handle));
@@ -238,6 +244,8 @@ int mlx5_fpga_tls_resync_rx(struct mlx5_core_dev *mdev, u32 handle, u32 seq,
buf->complete = mlx_tls_kfree_complete;
ret = mlx5_fpga_sbu_conn_sendmsg(mdev->fpga->tls->conn, buf);
if (ret < 0)
kfree(buf);
return ret;
}