[PULL 1/2] hw/nvme: fix oob memory read in fdp events log

[Klaus Jensen <its@irrelevant.dk>]

From: Klaus Jensen <k.jensen@samsung.com>

As reported by Trend Micro's Zero Day Initiative, an oob memory read
vulnerability exists in nvme_fdp_events(). The host-provided offset is
not verified.

Fix this.

This is only exploitable when Flexible Data Placement mode (fdp=on) is
enabled.

Fixes: CVE-2023-4135
Fixes: 73064edfb864 ("hw/nvme: flexible data placement emulation")
Reported-by: Trend Micro's Zero Day Initiative
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ctrl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index f2e5a2fa737b..e9b5a55811b8 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -5120,6 +5120,11 @@ static uint16_t nvme_fdp_events(NvmeCtrl *n, uint32_t endgrpid,
     }
 
     log_size = sizeof(NvmeFdpEventsLog) + ebuf->nelems * sizeof(NvmeFdpEvent);
+
+    if (off >= log_size) {
+        return NVME_INVALID_FIELD | NVME_DNR;
+    }
+
     trans_len = MIN(log_size - off, buf_len);
     elog = g_malloc0(log_size);
     elog->num_events = cpu_to_le32(ebuf->nelems);
-- 
2.41.0