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Allow to register a callback with fw_cfg_add_callback()

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fw_cfg_add_callback() checks if key has FW_CFG_WRITE_CHANNEL bit set
after masking the key with FW_CFG_ENTRY_MASK.

But as FW_CFG_ENTRY_MASK is ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL),
the bit is never set and function exits.

This patch corrects this by checking the bit before masking the value.

Signed-by-off: Laurent Vivier <Laurent.Vivier@bull.net>
Acked-by: Gleb Natapov <gleb@redhat.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5978 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
blueswir1 2008-12-11 17:30:50 +00:00
parent f4a5a5ba92
commit 85df0de4cf
1 changed files with 4 additions and 2 deletions
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6
hw/fw_cfg.c
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@ -240,10 +240,12 @@ int fw_cfg_add_callback(void *opaque, uint16_t key, FWCfgCallback callback,
FWCfgState *s = opaque;
int arch = !!(key & FW_CFG_ARCH_LOCAL);
if (!(key & FW_CFG_WRITE_CHANNEL))
return 0;
key &= FW_CFG_ENTRY_MASK;
if (key >= FW_CFG_MAX_ENTRY || !(key & FW_CFG_WRITE_CHANNEL)
|| len > 65535)
if (key >= FW_CFG_MAX_ENTRY || len > 65535)
return 0;
s->entries[arch][key].data = data;