Drivers: hv: vmbus: Check for ring when getting debug info

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commit ba50bf1ce9 upstream.

fc96df16a1 is good and can already fix the "return stack garbage" issue,
but let's also improve hv_ringbuffer_get_debuginfo(), which would silently
return stack garbage, if people forget to check channel->state or
ring_info->ring_buffer, when using the function in the future.

Having an error check in the function would eliminate the potential risk.

Add a Fixes tag to indicate the patch depdendency.

Fixes: fc96df16a1 ("Drivers: hv: vmbus: Return -EINVAL for the sys files for unopened channels")
Cc: stable@vger.kernel.org
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Dexuan Cui 2018-12-17 20:16:09 +00:00 • committed by Greg Kroah-Hartman

parent cdc5dc5b71

commit 7e66208d9e

3 changed files with 79 additions and 48 deletions

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29

drivers/hv/ring_buffer.c

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91

drivers/hv/vmbus_drv.c

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5

include/linux/hyperv.h

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