From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue, 6 May 2025 13:46:34 +0000 (+0000)
Subject: math: Fix UB in flt-32 rint
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98b2b7be53096944a8f99cf1da7761ae6c60d077;p=thirdparty%2Fglibc.git

math: Fix UB in flt-32 rint

UBSAN: Undefined behaviour in ../sysdeps/ieee754/flt-32/s_rintf.c:46:4 left shift of 1 by 31 cannot be represented in type 'int'
---

diff --git a/sysdeps/ieee754/flt-32/s_rintf.c b/sysdeps/ieee754/flt-32/s_rintf.c
index fe5258ae61..9e37c52411 100644
--- a/sysdeps/ieee754/flt-32/s_rintf.c
+++ b/sysdeps/ieee754/flt-32/s_rintf.c
@@ -30,7 +30,8 @@ __rintf (float x)
 		8.3886080000e+06, /* 0x4b000000 */
 		-8.3886080000e+06, /* 0xcb000000 */
   };
-  int32_t i0, j0, sx;
+  int32_t i0, j0;
+  uint32_t sx;
   float w, t;
   GET_FLOAT_WORD (i0, x);
   sx = (i0 >> 31) & 1;