[PATCH 1/4] hw/nvme: fix verification of number of ruhis

[Klaus Jensen <its@irrelevant.dk>]

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

Fix a off-by-one error when verifying the number of reclaim unit handle
identifiers specified in fdp.ruhs. To make the fix nicer, move the
verification of the fdp.nruh parameter to an earlier point.

Fixes: 73064edfb864 ("hw/nvme: flexible data placement emulation")
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ns.c     | 4 +---
 hw/nvme/subsys.c | 6 ++++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
index 547c0b154312..050fdaf50fcd 100644
--- a/hw/nvme/ns.c
+++ b/hw/nvme/ns.c
@@ -438,9 +438,7 @@ static bool nvme_ns_init_fdp(NvmeNamespace *ns, Error **errp)
 
     /* parse the placement handle identifiers */
     while ((token = qemu_strsep(&p, ";")) != NULL) {
-        ns->fdp.nphs += 1;
-        if (ns->fdp.nphs > NVME_FDP_MAXPIDS ||
-            ns->fdp.nphs == endgrp->fdp.nruh) {
+        if (ns->fdp.nphs++ == endgrp->fdp.nruh) {
             error_setg(errp, "too many placement handles");
             free(r);
             return false;
diff --git a/hw/nvme/subsys.c b/hw/nvme/subsys.c
index 24ddec860e45..d30bb8bfd5b4 100644
--- a/hw/nvme/subsys.c
+++ b/hw/nvme/subsys.c
@@ -158,8 +158,10 @@ static bool nvme_subsys_setup_fdp(NvmeSubsystem *subsys, Error **errp)
 
     endgrp->fdp.nrg = subsys->params.fdp.nrg;
 
-    if (!subsys->params.fdp.nruh) {
-        error_setg(errp, "fdp.nruh must be non-zero");
+    if (!subsys->params.fdp.nruh ||
+        subsys->params.fdp.nruh > NVME_FDP_MAXPIDS) {
+        error_setg(errp, "fdp.nruh must be non-zero and less than %u",
+                   NVME_FDP_MAXPIDS);
         return false;
     }
 
-- 
2.40.0