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Ensure strncpy'ed strings are all null terminated

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If there is no null byte among the first n bytes of the source the
resulting string will not be properly null terminated.
Ensure that all strings that are copied via strncpy are properly
terminated copy "sizeof (dest) - 1" bytes and manually terminate
the string in the cases the array was not initialized.

Example compiler warning:
  ../daemon/gamemode-tests.c: In function ‘run_cpu_governor_tests’:
  ../daemon/gamemode-tests.c:326:4: warning: ‘strncpy’ specified bound
      256 equals destination size [-Wstringop-truncation]
    strncpy(defaultgov, currentgov, CONFIG_VALUE_MAX);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This commit is contained in:
Christian Kellner
2019-03-21 09:55:51 +01:00
committed by Alex Smith
parent db4dd87e22
commit bbde1d0357
4 changed files with 12 additions and 11 deletions
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3
daemon/gamemode-gpu.c
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@@ -224,7 +224,8 @@ int game_mode_get_gpu(GameModeGPUInfo *info)
}
break;
case Vendor_AMD:
strncpy(info->amd_performance_level, buffer, CONFIG_VALUE_MAX);
strncpy(info->amd_performance_level, buffer, sizeof(info->amd_performance_level) - 1);
info->amd_performance_level[sizeof(info->amd_performance_level) - 1] = '\0';
break;
}