Passing an empty list of boundaries to block-latency-histogram-set sets
up a state that leads to a NULL pointer dereference when the next
request should be accounted for. This is not a useful configuration, so
just error out if the user tries to set it.
The crash can easily be reproduced with the following script:
qmp() {
cat <<EOF
{'execute':'qmp_capabilities'}
{'execute':'block-latency-histogram-set',
'arguments': {'id':'ide0','boundaries':[]}}
{'execute':'cont'}
EOF
}
qmp | ./qemu-system-x86_64 -S -qmp stdio \
-drive if=none,format=raw,file=null-co:// \
-device ide-hd,drive=none0,id=ide0
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20260331102608.60882-1-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
a55402d5c3