From: Dan Carpenter Date: Mon, 4 Feb 2013 11:22:36 +0000 (+0000) Subject: IB/mlx4: Fix bug unwinding on error in mlx4_ib_init_sriov() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cab66d1273e6490603cf5256155584d38cecca68;p=linux-beck.git IB/mlx4: Fix bug unwinding on error in mlx4_ib_init_sriov() We have to decrement "i" before calling mlx4_ib_free_demux_ctx() or we free something that wasn't allocated. That's fine for free_pv_object() but it would lead to a NULL dereference calling mlx4_ib_free_demux_ctx(). The null dereference is because ->tun is NULL when we check: if (!ctx->tun[i]) Also we didn't free ->sriov.demux[0] so it was a small leak. Signed-off-by: Dan Carpenter Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c index 0a903c129f0a..934792c477bc 100644 --- a/drivers/infiniband/hw/mlx4/mad.c +++ b/drivers/infiniband/hw/mlx4/mad.c @@ -1999,16 +1999,17 @@ int mlx4_ib_init_sriov(struct mlx4_ib_dev *dev) goto demux_err; err = mlx4_ib_alloc_demux_ctx(dev, &dev->sriov.demux[i], i + 1); if (err) - goto demux_err; + goto free_pv; } mlx4_ib_master_tunnels(dev, 1); return 0; +free_pv: + free_pv_object(dev, mlx4_master_func_num(dev->dev), i + 1); demux_err: - while (i > 0) { + while (--i >= 0) { free_pv_object(dev, mlx4_master_func_num(dev->dev), i + 1); mlx4_ib_free_demux_ctx(&dev->sriov.demux[i]); - --i; } mlx4_ib_device_unregister_sysfs(dev);