Red Hat Bugzilla – Bug 88104
uinitialized variable used for __ieee754_gammal_r(NaN,)
Last modified: 2016-11-24 10:13:08 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020529
Description of problem:
__tgammal(NaN) tests an uninitialized local variable because __ieee754_gammal_r
does not set *signgam for a NaN.
y = __ieee754_gammal_r(x,&local_signgam);
if (local_signgam < 0) y = -y;
if ((es & 0x7fff) == 0x7fff && ((hx & 0x7fffffff) | lx) != 0)
/* NaN, return it. */
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Run testcase math/test-ldouble and watch when x==NaN.
Actual Results: local_signgam is tested even though its value has not been set.
Expected Results: local_signgam is tested only when its value has been set.
It would be more efficient if __ieee754_gammal_r just set "*signgam = 0;"
immediately upon entry, instead of for [almost-]every boundary case.
An errata has been issued which should help the problem described in this bug report.
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen
this bug report if the solution does not work for you.