From: Pan Bian <bianpan2...@163.com> If uhw->inlen is non-zero, the value of variable err is 0 if the copy succeeds. Then, if kzalloc() or kmalloc() returns a NULL pointer, it will return 0 to the callers. As a result, the callers cannot detect the errors. This patch fixes the bug, assign "-ENOMEM" to err before the NULL pointer checks, and remove the initialization of err at the beginning.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189031 Signed-off-by: Pan Bian <bianpan2...@163.com> --- drivers/infiniband/hw/mlx4/main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index b597e82..a87c395 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -430,7 +430,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev, struct mlx4_ib_dev *dev = to_mdev(ibdev); struct ib_smp *in_mad = NULL; struct ib_smp *out_mad = NULL; - int err = -ENOMEM; + int err; int have_ib_ports; struct mlx4_uverbs_ex_query_device cmd; struct mlx4_uverbs_ex_query_device_resp resp = {.comp_mask = 0}; @@ -455,6 +455,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev, sizeof(resp.response_length); in_mad = kzalloc(sizeof *in_mad, GFP_KERNEL); out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL); + err = -ENOMEM; if (!in_mad || !out_mad) goto out; -- 1.9.1
