* [Qemu-devel] [PATCH] Allow to register a callback with fw_cfg_add_callback()
@ 2008-12-11 15:09 Laurent Vivier
2008-12-11 15:32 ` Gleb Natapov
0 siblings, 1 reply; 3+ messages in thread
From: Laurent Vivier @ 2008-12-11 15:09 UTC (permalink / raw)
To: Gleb Natapov; +Cc: Laurent Vivier, qemu-devel
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>
---
hw/fw_cfg.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
Index: qemu/hw/fw_cfg.c
===================================================================
--- qemu.orig/hw/fw_cfg.c 2008-12-11 15:55:15.000000000 +0100
+++ qemu/hw/fw_cfg.c 2008-12-11 15:55:41.000000000 +0100
@@ -240,10 +240,12 @@ int fw_cfg_add_callback(void *opaque, ui
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;
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] [PATCH] Allow to register a callback with fw_cfg_add_callback()
2008-12-11 15:09 [Qemu-devel] [PATCH] Allow to register a callback with fw_cfg_add_callback() Laurent Vivier
@ 2008-12-11 15:32 ` Gleb Natapov
2008-12-11 17:33 ` Blue Swirl
0 siblings, 1 reply; 3+ messages in thread
From: Gleb Natapov @ 2008-12-11 15:32 UTC (permalink / raw)
To: qemu-devel; +Cc: Laurent Vivier
On Thu, Dec 11, 2008 at 04:09:28PM +0100, Laurent Vivier wrote:
> 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>
> ---
> hw/fw_cfg.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> Index: qemu/hw/fw_cfg.c
> ===================================================================
> --- qemu.orig/hw/fw_cfg.c 2008-12-11 15:55:15.000000000 +0100
> +++ qemu/hw/fw_cfg.c 2008-12-11 15:55:41.000000000 +0100
> @@ -240,10 +240,12 @@ int fw_cfg_add_callback(void *opaque, ui
> 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;
>
--
Gleb.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH] Allow to register a callback with fw_cfg_add_callback()
2008-12-11 15:32 ` Gleb Natapov
@ 2008-12-11 17:33 ` Blue Swirl
0 siblings, 0 replies; 3+ messages in thread
From: Blue Swirl @ 2008-12-11 17:33 UTC (permalink / raw)
To: qemu-devel; +Cc: Laurent Vivier
On 12/11/08, Gleb Natapov <gleb@redhat.com> wrote:
> On Thu, Dec 11, 2008 at 04:09:28PM +0100, Laurent Vivier wrote:
> > 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>
Thanks, committed in r5978.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-12-11 15:09 [Qemu-devel] [PATCH] Allow to register a callback with fw_cfg_add_callback() Laurent Vivier
2008-12-11 15:32 ` Gleb Natapov
2008-12-11 17:33 ` Blue Swirl
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