[PATCH 2/9] hw/block/nvme: fix log page offset check

[Keith Busch]

Return error if the requested offset starts after the size of the log
being returned. Also, move the check for earlier in the function so
we're not doing unnecessary calculations.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 hw/block/nvme.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index db52ea0db9..8d2b5be567 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1179,6 +1179,10 @@ static uint16_t nvme_smart_info(NvmeCtrl *n, uint8_t 
rae, uint32_t buf_len,
         return NVME_INVALID_FIELD | NVME_DNR;
     }
 
+    if (off >= sizeof(smart)) {
+        return NVME_INVALID_FIELD | NVME_DNR;
+    }
+
     for (int i = 1; i <= n->num_namespaces; i++) {
         NvmeNamespace *ns = nvme_ns(n, i);
         if (!ns) {
@@ -1193,10 +1197,6 @@ static uint16_t nvme_smart_info(NvmeCtrl *n, uint8_t 
rae, uint32_t buf_len,
         write_commands += s->nr_ops[BLOCK_ACCT_WRITE];
     }
 
-    if (off > sizeof(smart)) {
-        return NVME_INVALID_FIELD | NVME_DNR;
-    }
-
     trans_len = MIN(sizeof(smart) - off, buf_len);
 
     memset(&smart, 0x0, sizeof(smart));
@@ -1234,12 +1234,11 @@ static uint16_t nvme_fw_log_info(NvmeCtrl *n, uint32_t 
buf_len, uint64_t off,
         .afi = 0x1,
     };
 
-    strpadcpy((char *)&fw_log.frs1, sizeof(fw_log.frs1), "1.0", ' ');
-
-    if (off > sizeof(fw_log)) {
+    if (off >= sizeof(fw_log)) {
         return NVME_INVALID_FIELD | NVME_DNR;
     }
 
+    strpadcpy((char *)&fw_log.frs1, sizeof(fw_log.frs1), "1.0", ' ');
     trans_len = MIN(sizeof(fw_log) - off, buf_len);
 
     return nvme_dma(n, (uint8_t *) &fw_log + off, trans_len,
@@ -1252,16 +1251,15 @@ static uint16_t nvme_error_info(NvmeCtrl *n, uint8_t 
rae, uint32_t buf_len,
     uint32_t trans_len;
     NvmeErrorLog errlog;
 
-    if (!rae) {
-        nvme_clear_events(n, NVME_AER_TYPE_ERROR);
+    if (off >= sizeof(errlog)) {
+        return NVME_INVALID_FIELD | NVME_DNR;
     }
 
-    if (off > sizeof(errlog)) {
-        return NVME_INVALID_FIELD | NVME_DNR;
+    if (!rae) {
+        nvme_clear_events(n, NVME_AER_TYPE_ERROR);
     }
 
     memset(&errlog, 0x0, sizeof(errlog));
-
     trans_len = MIN(sizeof(errlog) - off, buf_len);
 
     return nvme_dma(n, (uint8_t *)&errlog, trans_len,
-- 
2.24.1