Re: [EXTERNAL] [PATCH] hw/xen: Fix trace_xs_node_read() params

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Fri, 2025-05-23 at 16:01 +0000, Liam Merwick wrote:
> When the '--enable-trace-backends=syslog' build option is configured,
> the following compilation error is encountered.
> 
> In file included from /usr/include/sys/syslog.h:207,
>                  from /usr/include/syslog.h:1,
>                  from ./trace/trace-hw_xen.h:224,
>                  from ../hw/xen/trace.h:1,
>                  from ../hw/xen/xen-bus-helper.c:13:
> In function ‘syslog’,
>     inlined from ‘_nocheck__trace_xs_node_read’ at 
> ../hw/xen/trace-events:41:9,
>     inlined from ‘trace_xs_node_read’ at trace/trace-hw_xen.h:903:9,
>     inlined from ‘xs_node_read’ at ../hw/xen/xen-bus-helper.c:154:5:
> /usr/include/bits/syslog.h:45:3: error: ‘%s’ directive argument is null 
> [-Werror=format-overflow=]
>    45 |   __syslog_chk (__pri, __USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack 
> ());
>       |   
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Add a check that 'value' is not null before passing it to 
> trace_xs_node_read().
> 
> Fixes: e6cdeee95990 ("hw/xen: Add xs_node_read() helper function")
> Signed-off-by: Liam Merwick <liam.merwick@xxxxxxxxxx>

Acked-by: David Woodhouse <dwmw@xxxxxxxxxxxx>

Thanks.

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