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Fix also BIO_printf formatting for INF and NAN 

Avoid infinite loooooooops in %e and %g formatting for +/-INF and
make the invalid value at least visible by using '?' as signvalue.

Fixes #26973

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27491)

(cherry picked from commit b56dd5bfec)
This commit is contained in:
Bernd Edlinger 2025-04-24 21:09:40 +02:00 committed by Tomas Mraz
parent 30ceefaa4a
commit eb4e49dbab
1 changed files with 6 additions and 0 deletions
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6
crypto/bio/bio_print.c
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@ -535,6 +535,10 @@ static LDOUBLE abs_val(LDOUBLE value)
LDOUBLE result = value;
if (value < 0)
result = -value;
if (result > 0 && result / 2 == result) /* INF */
result = 0;
else if (result != result) /* NAN */
result = 0;
return result;
}
@ -591,6 +595,8 @@ fmtfp(char **sbuffer,
else if (flags & DP_F_SPACE)
signvalue = ' ';
ufvalue = abs_val(fvalue);
if (ufvalue == 0 && fvalue != 0) /* INF or NAN? */
signvalue = '?';
/*
* G_FORMAT sometimes prints like E_FORMAT and sometimes like F_FORMAT