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Commit ff53cc35 authored by Dexuan Cui's avatar Dexuan Cui Committed by Greg Kroah-Hartman
Browse files

Drivers: hv: vmbus: Return -EINVAL for the sys files for unopened channels 



commit fc96df16a1ce80cbb3c316ab7d4dc8cd5c2852ce upstream.

Before 98f4c651, we returned zeros for unopened channels.
With 98f4c651, we started to return random on-stack values.

We'd better return -EINVAL instead.

Fixes: 98f4c651 ("hv: move ringbuffer bus attributes to dev_groups")
Cc: stable@vger.kernel.org
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cc70f149

drivers/hv/vmbus_drv.c

+20 −0
Original line number Diff line number Diff line
@@ -300,6 +300,8 @@ static ssize_t out_intr_mask_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);

	return sprintf(buf, "%d\n", outbound.current_interrupt_mask);

}
@@ -313,6 +315,8 @@ static ssize_t out_read_index_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);

	return sprintf(buf, "%d\n", outbound.current_read_index);

}
@@ -327,6 +331,8 @@ static ssize_t out_write_index_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);

	return sprintf(buf, "%d\n", outbound.current_write_index);

}
@@ -341,6 +347,8 @@ static ssize_t out_read_bytes_avail_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);

	return sprintf(buf, "%d\n", outbound.bytes_avail_toread);

}
@@ -355,6 +363,8 @@ static ssize_t out_write_bytes_avail_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);

	return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);

}
@@ -368,6 +378,8 @@ static ssize_t in_intr_mask_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);

	return sprintf(buf, "%d\n", inbound.current_interrupt_mask);

}
@@ -381,6 +393,8 @@ static ssize_t in_read_index_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);

	return sprintf(buf, "%d\n", inbound.current_read_index);

}
@@ -394,6 +408,8 @@ static ssize_t in_write_index_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);

	return sprintf(buf, "%d\n", inbound.current_write_index);

}
@@ -408,6 +424,8 @@ static ssize_t in_read_bytes_avail_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);

	return sprintf(buf, "%d\n", inbound.bytes_avail_toread);

}
@@ -422,6 +440,8 @@ static ssize_t in_write_bytes_avail_show(struct device *dev, 


	if (!hv_dev->channel)

		return -ENODEV;

	if (hv_dev->channel->state != CHANNEL_OPENED_STATE)

		return -EINVAL;

	hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);

	return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);

}