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[PATCH v3 16/16] hw/i386/vmport: Assert vmport initialized before regist
From: |
Liran Alon |
Subject: |
[PATCH v3 16/16] hw/i386/vmport: Assert vmport initialized before registering commands |
Date: |
Thu, 12 Mar 2020 18:54:31 +0200 |
vmport_register() is also called from other modules such as vmmouse.
Therefore, these modules rely that vmport is realized before those call
sites. If this is violated, vmport_register() will NULL-deref.
To make such issues easier to debug, assert in vmport_register() that
vmport is already realized.
Reviewed-by: Nikita Leshenko <address@hidden>
Signed-off-by: Liran Alon <address@hidden>
---
hw/i386/vmport.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/hw/i386/vmport.c b/hw/i386/vmport.c
index 9d3921cf418d..134d793a4c65 100644
--- a/hw/i386/vmport.c
+++ b/hw/i386/vmport.c
@@ -83,6 +83,8 @@ static VMPortState *port_state;
void vmport_register(VMPortCommand command, VMPortReadFunc *func, void *opaque)
{
assert(command < VMPORT_ENTRIES);
+ assert(port_state);
+
trace_vmport_register(command, func, opaque);
port_state->func[command] = func;
port_state->opaque[command] = opaque;
--
2.20.1
- Re: [PATCH v3 10/16] hw/i386/vmport: Add support for CMD_GETTIME, (continued)
- [PATCH v3 09/16] hw/i386/vmport: Add support for CMD_GETBIOSUUID, Liran Alon, 2020/03/12
- [PATCH v3 11/16] hw/i386/vmport: Add support for CMD_GETTIMEFULL, Liran Alon, 2020/03/12
- [PATCH v3 12/16] hw/i386/vmport: Add support for CMD_GET_VCPU_INFO, Liran Alon, 2020/03/12
- [PATCH v3 13/16] hw/i386/vmport: Allow x2apic without IR, Liran Alon, 2020/03/12
- [PATCH v3 14/16] i386/cpu: Store LAPIC bus frequency in CPU structure, Liran Alon, 2020/03/12
- [PATCH v3 16/16] hw/i386/vmport: Assert vmport initialized before registering commands,
Liran Alon <=
- [PATCH v3 15/16] hw/i386/vmport: Add support for CMD_GETHZ, Liran Alon, 2020/03/12