Re: [patch, libgomp] Fix segfault with plugin-hsa

[Jakub Jelinek <jakub@redhat.com>]

On Wed, Sep 11, 2019 at 11:30:17AM +0200, Tobias Burnus wrote:
> when playing around with offloading, I got an hsa initialization error
> (/dev/... lacked write permission) and the library call returned with an
> error status – but hsa_fns.hsa_status_string_fn didn't set the message to
> the string variable.
> 
> Hence, the string variable was uninitialized and libgomp crashed when
> printing the error message; "[unknown]" is not the best HSA run-time
> message, but at least the primary message is shown and there is no crash :-)

LGTM, but give Martin (CCed) as the author a chance to chime in.

> 2019-09-11  Tobias Burnus  <tobias@codesourcery.com>
> 
>         * plugin/plugin-hsa.c (hsa_warn, hsa_fatal, hsa_error): Ensure
>         string is initialized.
> 
> diff --git a/libgomp/plugin/plugin-hsa.c b/libgomp/plugin/plugin-hsa.c
> index 80f23f9beb6..c0837d04e5d 100644
> --- a/libgomp/plugin/plugin-hsa.c
> +++ b/libgomp/plugin/plugin-hsa.c
> @@ -289,7 +289,7 @@ hsa_warn (const char *str, hsa_status_t status)
>    if (!debug)
>      return;
> -  const char *hsa_error_msg;
> +  const char *hsa_error_msg = "[unknown]";
>    hsa_fns.hsa_status_string_fn (status, &hsa_error_msg);
>    fprintf (stderr, "HSA warning: %s\nRuntime message: %s", str, hsa_error_msg);
> @@ -301,7 +301,7 @@ hsa_warn (const char *str, hsa_status_t status)
>  static void
>  hsa_fatal (const char *str, hsa_status_t status)
>  {
> -  const char *hsa_error_msg;
> +  const char *hsa_error_msg = "[unknown]";
>    hsa_fns.hsa_status_string_fn (status, &hsa_error_msg);
>    GOMP_PLUGIN_fatal ("HSA fatal error: %s\nRuntime message: %s", str,
>  		     hsa_error_msg);
> @@ -313,7 +313,7 @@ hsa_fatal (const char *str, hsa_status_t status)
>  static bool
>  hsa_error (const char *str, hsa_status_t status)
>  {
> -  const char *hsa_error_msg;
> +  const char *hsa_error_msg = "[unknown]";
>    hsa_fns.hsa_status_string_fn (status, &hsa_error_msg);
>    GOMP_PLUGIN_error ("HSA fatal error: %s\nRuntime message: %s", str,
>  		     hsa_error_msg);
> 

	Jakub