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--- a/src/strtofr.c
+++ b/src/strtofr.c
@@ -473,8 +473,10 @@
/* prec bits corresponds to ysize limbs */
ysize_bits = ysize * GMP_NUMB_BITS;
/* and to ysize_bits >= prec > MPFR_PREC (x) bits */
- y = MPFR_TMP_LIMBS_ALLOC (2 * ysize + 1);
- y += ysize; /* y has (ysize+1) allocated limbs */
+ /* we need to allocate one more limb to work around bug
+ https://gmplib.org/list-archives/gmp-bugs/2013-December/003267.html */
+ y = MPFR_TMP_LIMBS_ALLOC (2 * ysize + 2);
+ y += ysize; /* y has (ysize+2) allocated limbs */
/* pstr_size is the number of characters we read in pstr->mant
to have at least ysize full limbs.
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