Re: [Intel-gfx] [PATCH i-g-t] tools/intel_reg: Fix segfault in intel_reg dump

[Mika Kuoppala]

Mika Kuoppala  writes:

> We need to zero out the builtin reg spec we are parsing into.
> Otherwise engine will be uninitialized and we segfault when trying
> to find engine and accessing reg->engine in later stage.
>

Chris combined both file and builting based fixes. We can omit this.
-Mika


> v2: use {} (Jani)
>
> Fixes: 7f0be0e7d9be ("tools/intel_reg: Add reading and writing registers 
> through engine")
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104895
> Cc: Chris Wilson 
> Cc: Marta Löfstedt 
> Cc: Jani Nikula 
> Signed-off-by: Mika Kuoppala 
> Reviewed-by: Jani Nikula 
> ---
>  tools/intel_reg_decode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/intel_reg_decode.c b/tools/intel_reg_decode.c
> index 46b19676..f3c7d74a 100644
> --- a/tools/intel_reg_decode.c
> +++ b/tools/intel_reg_decode.c
> @@ -2746,7 +2746,7 @@ static ssize_t get_regs(struct reg **regs, size_t 
> *nregs, ssize_t index,
>   for (j = 0; j < known_registers[i].count; j++) {
>   const struct reg_debug *reg_in =
>   _registers[i].regs[j];
> - struct reg reg;
> + struct reg reg = {};
>  
>   /* XXX: Could be optimized. */
>   parse_port_desc(, NULL);
> -- 
> 2.14.1
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Re: [Intel-gfx] [PATCH i-g-t] tools/intel_reg: Fix segfault in intel_reg dump

[Jani Nikula]

On Fri, 02 Feb 2018, Mika Kuoppala  wrote:
> We need to zero out the builtin reg spec we are parsing into.
> Otherwise engine will be uninitialized and we segfault when trying
> to find engine and accessing reg->engine in later stage.
>
> Fixes: 7f0be0e7d9be ("tools/intel_reg: Add reading and writing registers 
> through engine")
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104895
> Cc: Chris Wilson 
> Cc: Marta Löfstedt 
> Cc: Jani Nikula 
> Signed-off-by: Mika Kuoppala 

Personal preference, I would've gone for = {} but this is fine.

Reviewed-by: Jani Nikula 

> ---
>  tools/intel_reg_decode.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/intel_reg_decode.c b/tools/intel_reg_decode.c
> index 46b19676..b351dcb5 100644
> --- a/tools/intel_reg_decode.c
> +++ b/tools/intel_reg_decode.c
> @@ -2748,6 +2748,8 @@ static ssize_t get_regs(struct reg **regs, size_t 
> *nregs, ssize_t index,
>   _registers[i].regs[j];
>   struct reg reg;
>  
> + memset(, 0, sizeof(reg));
> +
>   /* XXX: Could be optimized. */
>   parse_port_desc(, NULL);

-- 
Jani Nikula, Intel Open Source Technology Center
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