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hwcaps: dont return an uninitialized hwcap on elf_aux_info failure #466

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hwcaps: dont return an uninitialized hwcap on elf_aux_info failure #466

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5 changes: 4 additions & 1 deletion src/hwcaps_freebsd_or_openbsd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,10 @@ const char* CpuFeatures_GetBasePlatformPointer(void);
#include <sys/auxv.h>

static unsigned long GetElfHwcapFromElfAuxInfo(int hwcap_type) {
unsigned long hwcap;
unsigned long hwcap = 0;
// elf_aux_info() leaves the output buffer untouched when the requested entry
// is absent (e.g. AT_HWCAP2 on some arch/kernel combos), so initializing
// hwcap to 0 avoids returning an indeterminate value on failure.
elf_aux_info(hwcap_type, &hwcap, sizeof(hwcap));
return hwcap;
}
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