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Re: [PATCH 06/10] stubdom/xenstored: Fix uninitialised variables in lu_read_state()



On 12.02.21 16:39, Andrew Cooper wrote:
Various version of gcc, when compiling with -Og, complain:

   xenstored_control.c: In function ‘lu_read_state’:
   xenstored_control.c:540:11: error: ‘state.size’ is used uninitialized in this
   function [-Werror=uninitialized]
     if (state.size == 0)
         ~~~~~^~~~~
   xenstored_control.c:543:6: error: ‘state.buf’ may be used uninitialized in
   this function [-Werror=maybe-uninitialized]
     pre = state.buf;
     ~~~~^~~~~~~~~~~
   xenstored_control.c:550:23: error: ‘state.buf’ may be used uninitialized in
   this function [-Werror=maybe-uninitialized]
      (void *)head - state.buf < state.size;
                     ~~~~~^~~~
   xenstored_control.c:550:35: error: ‘state.size’ may be used uninitialized in
   this function [-Werror=maybe-uninitialized]
      (void *)head - state.buf < state.size;
                                 ~~~~~^~~~~

Interestingly, this is only in the stubdom build.  I can't identify any
relevant differences vs the regular tools build.

But me. :-)

lu_get_dump_state() is empty for the stubdom case (this will change when
LU is implemented for stubdom, too). In the daemon case this function is
setting all the fields which are relevant.


Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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