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[PATCH] hyperv: add check for NULL for msg
From: |
Anastasia Belova |
Subject: |
[PATCH] hyperv: add check for NULL for msg |
Date: |
Thu, 28 Sep 2023 16:25:19 +0300 |
cpu_physical_memory_map may return NULL in hyperv_hcall_post_message.
Add check for NULL to avoid NULL-dereference.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 76036a5fc7 ("hyperv: process POST_MESSAGE hypercall")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
---
hw/hyperv/hyperv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/hyperv/hyperv.c b/hw/hyperv/hyperv.c
index 57b402b956..61c65d7329 100644
--- a/hw/hyperv/hyperv.c
+++ b/hw/hyperv/hyperv.c
@@ -588,7 +588,7 @@ uint16_t hyperv_hcall_post_message(uint64_t param, bool
fast)
len = sizeof(*msg);
msg = cpu_physical_memory_map(param, &len, 0);
- if (len < sizeof(*msg)) {
+ if (!msg || len < sizeof(*msg)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto unmap;
}
--
2.30.2
- [PATCH] hyperv: add check for NULL for msg,
Anastasia Belova <=