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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
eef70df
..
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++;
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;
}
}
if (!gotrad) lrp=dc;
@@
-172,6
+175,9
@@
static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
return sign * (long double)x[0] * p10s[rp-10];
}
return sign * (long double)x[0] * p10s[rp-10];
}
+ /* Drop trailing zeros */
+ for (; !x[z-1]; z--);
+
/* Align radix point to B1B digit boundary */
if (rp % 9) {
int rpm9 = rp>=0 ? rp%9 : rp%9+9;
/* Align radix point to B1B digit boundary */
if (rp % 9) {
int rpm9 = rp>=0 ? rp%9 : rp%9+9;