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-rw-r--r--crypto/bio/b_print.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/crypto/bio/b_print.c b/crypto/bio/b_print.c
index 8ef90ac1d4f8..41b7f5e2f61d 100644
--- a/crypto/bio/b_print.c
+++ b/crypto/bio/b_print.c
@@ -1,5 +1,5 @@
/*
- * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
@@ -635,7 +635,11 @@ fmtfp(char **sbuffer,
fvalue = tmpvalue;
}
ufvalue = abs_val(fvalue);
- if (ufvalue > ULONG_MAX) {
+ /*
+ * By subtracting 65535 (2^16-1) we cancel the low order 15 bits
+ * of ULONG_MAX to avoid using imprecise floating point values.
+ */
+ if (ufvalue >= (double)(ULONG_MAX - 65535) + 65536.0) {
/* Number too big */
return 0;
}