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fw_cfg: prevent selector key conflict

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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>
This commit is contained in:
Gabriel L. Somlo 2015-04-29 11:21:51 -04:00 committed by Gerd Hoffmann
parent 023e314856
commit 0f9b214139
1 changed files with 1 additions and 0 deletions
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1
hw/nvram/fw_cfg.c
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@ -423,6 +423,7 @@ static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
key &= FW_CFG_ENTRY_MASK; key &= FW_CFG_ENTRY_MASK;
assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX); 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].data = data;
s->entries[arch][key].len = (uint32_t)len; s->entries[arch][key].len = (uint32_t)len;