Drivers: vmbus: Check for channel allocation before looking up relids
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: 8b6a877c ("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.comSigned-off-by:
Wei Liu <wei.liu@kernel.org>
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