fix undefined behavior in strto* via FILE buffer pointer abuse

[musl] / src / internal / floatscan.c

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index 80305ee..278bf25 100644 (file)
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -110,7 +110,10 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
                        gotdig=1;
                } else {
                        dc++;
-                       if (c!='0') x[KMAX-4] |= 1;
+                       if (c!='0') {
+                               lnz = (KMAX-4)*9;
+                               x[KMAX-4] |= 1;
+                       }
                }
        }
        if (!gotrad) lrp=dc;