[PULL,01/11] hw/nvme: fix narrowing conversion

Commit Message

Klaus Jensen June 3, 2022, 7:53 p.m. UTC

From: Dmitry Tikhov <[e-mail]>

Since nlbas is of type int, it does not work with large namespace size
values, e.g., 9 TB size of file backing namespace and 8 byte metadata
with 4096 bytes lbasz gives negative nlbas value, which is later
promoted to negative int64_t type value and results in negative
ns->moff which breaks namespace

Signed-off-by: Dmitry Tikhov <[e-mail]>
Reviewed-by: Klaus Jensen <[e-mail]>
Signed-off-by: Klaus Jensen <[e-mail]>
---
 hw/nvme/ns.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
index 324f53ea0cd1..af6504fad2d8 100644
--- a/hw/nvme/ns.c
+++ b/hw/nvme/ns.c
@@ -29,7 +29,8 @@  void nvme_ns_init_format(NvmeNamespace *ns)
 {
     NvmeIdNs *id_ns = &ns->id_ns;
     BlockDriverInfo bdi;
-    int npdg, nlbas, ret;
+    int npdg, ret;
+    int64_t nlbas;
 
     ns->lbaf = id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
     ns->lbasz = 1 << ns->lbaf.ds;
@@ -42,7 +43,7 @@  void nvme_ns_init_format(NvmeNamespace *ns)
     id_ns->ncap = id_ns->nsze;
     id_ns->nuse = id_ns->ncap;
 
-    ns->moff = (int64_t)nlbas << ns->lbaf.ds;
+    ns->moff = nlbas << ns->lbaf.ds;
 
     npdg = ns->blkconf.discard_granularity / ns->lbasz;