[Qemu-devel] [PULL 3/6] fw_cfg: prevent selector key conflict

[Gerd Hoffmann <kraxel@redhat.com>]

From: "Gabriel L. Somlo" <somlo@cmu.edu>

Enforce a single assignment of data for each distinct selector key.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/nvram/fw_cfg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index ed70798..227beaf 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;
-- 
1.8.3.1