diff mbox series

[11/17] hw/block/nvme: harden cmb access

Message ID 20200904141956.576630-12-its@irrelevant.dk
State Superseded
Headers show
Series hw/block/nvme: multiple namespaces support | expand

Commit Message

Klaus Jensen Sept. 4, 2020, 2:19 p.m. UTC 
From: Klaus Jensen <k.jensen@samsung.com>

Since the controller has only supported PRPs so far it has not been
required to check the ending address (addr + len - 1) of the CMB access
for validity since it has been guaranteed to be in range of the CMB.

This changes when the controller adds support for SGLs (next patch), so
add that check.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 36ec8cbb1168..6ef4dc762b80 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -143,7 +143,12 @@  static inline void *nvme_addr_to_cmb(NvmeCtrl *n, hwaddr addr)
 
 static int nvme_addr_read(NvmeCtrl *n, hwaddr addr, void *buf, int size)
 {
-    if (n->bar.cmbsz && nvme_addr_is_cmb(n, addr)) {
+    hwaddr hi = addr + size - 1;
+    if (hi < addr) {
+        return 1;
+    }
+
+    if (n->bar.cmbsz && nvme_addr_is_cmb(n, addr) && nvme_addr_is_cmb(n, hi)) {
         memcpy(buf, nvme_addr_to_cmb(n, addr), size);
         return 0;
     }