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Fix from glibc for possible crash when printf()'ing a long double.

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This commit is contained in:
Alex Smith 2012-08-14 20:08:42 +01:00
parent 4efc3430a0
commit 91899cd48d
1 changed files with 9 additions and 2 deletions
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11
src/system/libroot/posix/glibc/arch/x86/ldbl2mpn.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
/* Copyright (C) 1995, 1996, 1997, 2000, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -46,7 +46,7 @@ __mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
#elif BITS_PER_MP_LIMB == 64
/* Hopefully the compiler will combine the two bitfield extracts
and this composition into just the original quadword extract. */
res_ptr[0] = ((unsigned long int) u.ieee.mantissa0 << 32) | u.ieee.mantissa1;
res_ptr[0] = ((mp_limb_t) u.ieee.mantissa0 << 32) | u.ieee.mantissa1;
#define N 1
#else
#error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
@ -109,6 +109,13 @@ __mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
}
}
}
else if (u.ieee.exponent < 0x7fff
#if N == 2
&& res_ptr[0] == 0
#endif
&& res_ptr[N - 1] == 0)
/* Pseudo zero. */
*expt = 0;
return N;
}