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Mohammed Gamal 176c6b4889 Drivers: vmbus: Check for channel allocation before looking up relids

[ Upstream commit 1eb65c8687316c65140b48fad27133d583178e15 ]

relid2channel() assumes vmbus channel array to be allocated when called.
However, in cases such as kdump/kexec, not all relids will be reset by the host.
When the second kernel boots and if the guest receives a vmbus interrupt during
vmbus driver initialization before vmbus_connect() is called, before it finishes,
or if it fails, the vmbus interrupt service routine is called which in turn calls
relid2channel() and can cause a null pointer dereference.

Print a warning and error out in relid2channel() for a channel id that's invalid
in the second kernel.

Fixes: 8b6a877c060e ("Drivers: hv: vmbus: Replace the per-CPU channel lists with a global array of channels")

Signed-off-by: Mohammed Gamal <mgamal@redhat.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Link: https://lore.kernel.org/r/20230217204411.212709-1-mgamal@redhat.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2023-04-20 12:10:21 +02:00

channel_mgmt.c

Drivers: hv: vmbus: fix double free in the error path of vmbus_add_channel_work()

2022-12-02 17:40:00 +01:00

channel.c

Drivers: hv: vmbus: Use after free in __vmbus_open()

2021-05-14 09:50:20 +02:00

connection.c

Drivers: vmbus: Check for channel allocation before looking up relids

2023-04-20 12:10:21 +02:00

hv_balloon.c

hv_balloon: rate-limit "Unhandled message" warning