prevent CNAME/PTR parsing from reading data past the response end

[musl] / src / math / nexttowardf.c

diff --git a/src/math/nexttowardf.c b/src/math/nexttowardf.c
index 821f72a..bbf172f 100644 (file)
--- a/src/math/nexttowardf.c
+++ b/src/math/nexttowardf.c
@@ -2,36 +2,34 @@
 
 float nexttowardf(float x, long double y)
 {
-       union fshape ux;
+       union {float f; uint32_t i;} ux = {x};
        uint32_t e;
 
        if (isnan(x) || isnan(y))
                return x + y;
        if (x == y)
                return y;
-       ux.value = x;
        if (x == 0) {
-               ux.bits = 1;
+               ux.i = 1;
                if (signbit(y))
-                       ux.bits |= 0x80000000;
+                       ux.i |= 0x80000000;
        } else if (x < y) {
                if (signbit(x))
-                       ux.bits--;
+                       ux.i--;
                else
-                       ux.bits++;
+                       ux.i++;
        } else {
                if (signbit(x))
-                       ux.bits++;
+                       ux.i++;
                else
-                       ux.bits--;
+                       ux.i--;
        }
-       e = ux.bits & 0x7f800000;
-       /* raise overflow if ux.value is infinite and x is finite */
+       e = ux.i & 0x7f800000;
+       /* raise overflow if ux.f is infinite and x is finite */
        if (e == 0x7f800000)
-               return x + x;
-       /* raise underflow if ux.value is subnormal or zero */
-       if (e == 0) {
-               volatile float z = x*x + ux.value*ux.value;
-       }
-       return ux.value;
+               FORCE_EVAL(x+x);
+       /* raise underflow if ux.f is subnormal or zero */
+       if (e == 0)
+               FORCE_EVAL(x*x + ux.f*ux.f);
+       return ux.f;
 }