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coredump: simplify bad regnum checks a little

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We always want to reject negative regnums since we use it as an index,
so make it a common check at the top for all arches.
This commit is contained in:
Mike Frysinger 2017-02-13 21:32:54 -05:00 committed by Dave Watson
parent 00cca00716
commit f3f456c0d1
1 changed files with 8 additions and 5 deletions
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13
src/coredump/_UCD_access_reg_linux.c
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@ -39,17 +39,20 @@ _UCD_access_reg (unw_addr_space_t as,
return -UNW_EINVAL;
}
if (regnum < 0)
goto badreg;
#if defined(UNW_TARGET_AARCH64)
if (regnum < 0 || regnum >= UNW_AARCH64_FPCR)
if (regnum >= UNW_AARCH64_FPCR)
goto badreg;
#elif defined(UNW_TARGET_ARM)
if (regnum < 0 || regnum >= 16)
if (regnum >= 16)
goto badreg;
#elif defined(UNW_TARGET_SH)
if (regnum < 0 || regnum > UNW_SH_PR)
if (regnum > UNW_SH_PR)
goto badreg;
#elif defined(UNW_TARGET_TILEGX)
if (regnum < 0 || regnum > UNW_TILEGX_CFA)
if (regnum > UNW_TILEGX_CFA)
goto badreg;
#else
#if defined(UNW_TARGET_MIPS)
@ -120,7 +123,7 @@ _UCD_access_reg (unw_addr_space_t as,
#error Port me
#endif
if (regnum < 0 || regnum >= (unw_regnum_t)ARRAY_SIZE(remap_regs))
if (regnum >= (unw_regnum_t)ARRAY_SIZE(remap_regs))
goto badreg;
regnum = remap_regs[regnum];