X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/f94b972d1c0389e4e9203cc9919ceaadbe655b61..f4535c6454395e6d56ce0091a07b6d4f7d54a47f:/f-niceprime.c

diff --git a/f-niceprime.c b/f-niceprime.c
index a6191da..ce96977 100644
--- a/f-niceprime.c
+++ b/f-niceprime.c
@@ -138,7 +138,7 @@ static const field_ops fops = {
  *
  * Arguments:	@mp *p@ = the characteristic of the field
  *
- * Returns:	A pointer to the field.
+ * Returns:	A pointer to the field, or null.
  *
  * Use:		Creates a field structure for a prime field of size %$p$%,
  *		using efficient reduction for nice primes.
@@ -152,7 +152,10 @@ field *field_niceprime(mp *p)
   f->f.one = MP_ONE;
   f->f.nbits = mp_bits(p);
   f->f.noctets = (f->f.nbits + 7) >> 3;
-  mpreduce_create(&f->r, p);
+  if (mpreduce_create(&f->r, p)) {
+    DESTROY(f);
+    return (0);
+  }
   f->f.m = f->r.p;
   return (&f->f);
 }