From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon, 5 May 2025 12:45:48 +0000 (-0300)
Subject: math: Fix UB in ldbl-128 nearbyintl
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f65638ed1142ea68e07a345450d5c1f8b55fde3;p=thirdparty%2Fglibc.git

math: Fix UB in ldbl-128 nearbyintl

UBSAN: Undefined behaviour in ../sysdeps/ieee754/float128/../ldbl-128/s_nearbyintl.c:61:4 left shift of 1 by 63 cannot be represented in type 'long int'
---

diff --git a/sysdeps/ieee754/ldbl-128/s_nearbyintl.c b/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
index d76d0155ad..b72ca2f016 100644
--- a/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
+++ b/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
@@ -42,7 +42,8 @@ __nearbyintl (_Float128 x)
 		 L(-5.19229685853482762853049632922009600E+33)  /* 0xC06F000000000000, 0 */
   };
   fenv_t env;
-  int64_t i0, j0, sx;
+  int64_t i0, j0;
+  uint64_t sx;
   uint64_t i1 __attribute__ ((unused));
   _Float128 w, t;
   GET_LDOUBLE_WORDS64 (i0, i1, x);