Re: [PATCH i-g-t] intel_gpu_top: Fix cleanup on old kernels / unsupported GPU

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On 20/01/2023 14:29, Das, Nirmoy wrote:
Hi Tvrtko,

On 1/19/2023 4:54 PM, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Avoid trying to dereference null engines on exit when there are either
none which are supported, or kernel does not have i915 PMU support.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
  tools/intel_gpu_top.c | 10 +++++++---
  1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index 7aa233570463..517dc2995d26 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -448,6 +448,9 @@ static void free_engines(struct engines *engines)
      };
      unsigned int i;
+    if (!engines)
+        return;
+


This check should happen before the  struct pmu_counter free_list generation.

I could, but it doesn't have to, not sure what reasons for should you have in mind?

Regards,

Tvrtko


Regards,

Nirmoy

      for (pmu = &free_list[0]; *pmu; pmu++) {
          if ((*pmu)->present)
              free((char *)(*pmu)->units);
@@ -2568,7 +2571,7 @@ int main(int argc, char **argv)
              "Failed to detect engines! (%s)\n(Kernel 4.16 or newer is required for i915 PMU support.)\n",
              strerror(errno));
          ret = EXIT_FAILURE;
-        goto err;
+        goto err_engines;
      }
      ret = pmu_init(engines);
@@ -2585,7 +2588,7 @@ int main(int argc, char **argv)
  "More information can be found at 'Perf events and tool security' document:\n" "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n";);
          ret = EXIT_FAILURE;
-        goto err;
+        goto err_pmu;
      }
      ret = EXIT_SUCCESS;
@@ -2699,8 +2702,9 @@ int main(int argc, char **argv)
          free_clients(clients);
      free(codename);
-err:
+err_pmu:
      free_engines(engines);
+err_engines:
      free(pmu_device);
  exit:
      igt_devices_free();



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