X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fbn%2Fbn_gf2m.c;h=8a4dc20ad980d9b3bf9849bef739e0cedc3fcb7c;hb=265863c6a45273ad175f59b160aba8f5f3475458;hp=08ab9fd22743578607119fa53fcb45c08b97fe5b;hpb=2fee1e06661e26518fab28b1745f5556c2b80f67;p=oweals%2Fopenssl.git

diff --git a/crypto/bn/bn_gf2m.c b/crypto/bn/bn_gf2m.c
index 08ab9fd227..8a4dc20ad9 100644
--- a/crypto/bn/bn_gf2m.c
+++ b/crypto/bn/bn_gf2m.c
@@ -628,8 +628,11 @@ int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
 			}
 		if (ubits==vbits)
 			{
-			bn_correct_top(u);
-			ubits = BN_num_bits(u);
+			BN_ULONG ul;
+			int utop = (ubits-1)/BN_BITS2;
+
+			while ((ul=udp[utop])==0 && utop) utop--;
+			ubits = utop*BN_BITS2 + BN_num_bits_word(ul);
 			}
 		}
 	bn_correct_top(b);