From: Klaus Jensen
Hoist bounds checking into its own function and check for wrap-around.
Signed-off-by: Klaus Jensen
Reviewed-by: Maxim Levitsky
---
hw/block/nvme.c | 26 +-
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 530f5155eac0..35bc1a7b7e21 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -553,6 +553,18 @@ static void nvme_clear_events(NvmeCtrl *n, uint8_t
event_type)
}
}
+static inline uint16_t nvme_check_bounds(NvmeCtrl *n, NvmeNamespace *ns,
+ uint64_t slba, uint32_t nlb)
+{
+uint64_t nsze = le64_to_cpu(ns->id_ns.nsze);
+
+if (unlikely(UINT64_MAX - slba < nlb || slba + nlb > nsze)) {
+return NVME_LBA_RANGE | NVME_DNR;
+}
+
+return NVME_SUCCESS;
+}
+
static void nvme_rw_cb(void *opaque, int ret)
{
NvmeRequest *req = opaque;
@@ -600,12 +612,14 @@ static uint16_t nvme_write_zeros(NvmeCtrl *n,
NvmeNamespace *ns, NvmeCmd *cmd,
uint32_t nlb = le16_to_cpu(rw->nlb) + 1;
uint64_t offset = slba << data_shift;
uint32_t count = nlb << data_shift;
+uint16_t status;
trace_pci_nvme_write_zeroes(nvme_cid(req), slba, nlb);
-if (unlikely(slba + nlb > ns->id_ns.nsze)) {
+status = nvme_check_bounds(n, ns, slba, nlb);
+if (status) {
trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze);
-return NVME_LBA_RANGE | NVME_DNR;
+return status;
}
block_acct_start(blk_get_stats(n->conf.blk), >acct, 0,
@@ -628,13 +642,15 @@ static uint16_t nvme_rw(NvmeCtrl *n, NvmeNamespace *ns,
NvmeCmd *cmd,
uint64_t data_offset = slba << data_shift;
int is_write = rw->opcode == NVME_CMD_WRITE ? 1 : 0;
enum BlockAcctType acct = is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ;
+uint16_t status;
trace_pci_nvme_rw(is_write ? "write" : "read", nlb, data_size, slba);
-if (unlikely((slba + nlb) > ns->id_ns.nsze)) {
-block_acct_invalid(blk_get_stats(n->conf.blk), acct);
+status = nvme_check_bounds(n, ns, slba, nlb);
+if (status) {
trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze);
-return NVME_LBA_RANGE | NVME_DNR;
+block_acct_invalid(blk_get_stats(n->conf.blk), acct);
+return status;
}
if (nvme_map(n, cmd, data_size, req)) {
--
2.27.0