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fw_cfg: fix crash if FW_CFG_WRITE_CHANNEL is used incorrectly 

Avoid a crash if the guest combines FW_CFG_WRITE_CHANNEL with
a wrong value.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2011-08-26 18:43:18 +00:00
parent 9f8d2a093f
commit 962d4b2834
1 changed files with 2 additions and 1 deletions
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3
hw/fw_cfg.c
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@ -214,7 +214,8 @@ static void fw_cfg_write(FWCfgState *s, uint8_t value)
FW_CFG_DPRINTF("write %d\n", value);
if (s->cur_entry & FW_CFG_WRITE_CHANNEL && s->cur_offset < e->len) {
if (s->cur_entry & FW_CFG_WRITE_CHANNEL && e->callback &&
s->cur_offset < e->len) {
e->data[s->cur_offset++] = value;
if (s->cur_offset == e->len) {
e->callback(e->callback_opaque, e->data);