From e64a826c128582b7af72680bd51b27f44803c829 Mon Sep 17 00:00:00 2001 From: Alaa Hleihel Date: Sun, 10 May 2020 14:52:11 -0400 Subject: [PATCH 042/312] [netdrv] net/mlx5: Fix return code in case of hyperv wrong size read Message-id: <20200510145245.10054-49-ahleihel@redhat.com> Patchwork-id: 306590 Patchwork-instance: patchwork O-Subject: [RHEL8.3 BZ 1789378 v2 48/82] net/mlx5: Fix return code in case of hyperv wrong size read Bugzilla: 1789378 RH-Acked-by: Kamal Heib RH-Acked-by: Jarod Wilson RH-Acked-by: Tony Camuso RH-Acked-by: Jonathan Toppins Bugzilla: http://bugzilla.redhat.com/1789378 Upstream: v5.4-rc1 commit 87cade2997c9210cfeb625957e44b865a89d0c13 Author: Eran Ben Elisha Date: Fri Aug 23 15:34:47 2019 +0300 net/mlx5: Fix return code in case of hyperv wrong size read Return code value could be non deterministic in case of wrong size read. With this patch, if such error occurs, set rc to be -EIO. In addition, mlx5_hv_config_common() supports reading of HV_CONFIG_BLOCK_SIZE_MAX bytes only, fix to early return error with bad input. Fixes: 913d14e86657 ("net/mlx5: Add wrappers for HyperV PCIe operations") Reported-by: Leon Romanovsky Signed-off-by: Eran Ben Elisha Signed-off-by: David S. Miller Signed-off-by: Alaa Hleihel Signed-off-by: Frantisek Hrbata --- drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c index cf08d02703fb..583dc7e2aca8 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv.c @@ -12,7 +12,7 @@ static int mlx5_hv_config_common(struct mlx5_core_dev *dev, void *buf, int len, int bytes_returned; int block_id; - if (offset % HV_CONFIG_BLOCK_SIZE_MAX || len % HV_CONFIG_BLOCK_SIZE_MAX) + if (offset % HV_CONFIG_BLOCK_SIZE_MAX || len != HV_CONFIG_BLOCK_SIZE_MAX) return -EINVAL; block_id = offset / HV_CONFIG_BLOCK_SIZE_MAX; @@ -25,8 +25,8 @@ static int mlx5_hv_config_common(struct mlx5_core_dev *dev, void *buf, int len, HV_CONFIG_BLOCK_SIZE_MAX, block_id); /* Make sure len bytes were read successfully */ - if (read) - rc |= !(len == bytes_returned); + if (read && !rc && len != bytes_returned) + rc = -EIO; if (rc) { mlx5_core_err(dev, "Failed to %s hv config, err = %d, len = %d, offset = %d\n", -- 2.13.6