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-rw-r--r--hw/nvram/fw_cfg.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index d2a43470e0..0c0e15ecf5 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -423,6 +423,7 @@ static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
key &= FW_CFG_ENTRY_MASK;
assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);
+ assert(s->entries[arch][key].data == NULL); /* avoid key conflict */
s->entries[arch][key].data = data;
s->entries[arch][key].len = (uint32_t)len;