X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_div.c;h=bbd09940089cf38cabc3f014f04682c083413dca;hp=7bee1dcc724efa8dc91034d7adc4c39053c258f2;hb=3d2e469cfab1ea3a0515bfe006319210da3ff4fb;hpb=bf401a2aef5a130ef21de4575f3a7c3d7a6f5e2a

diff --git a/crypto/bn/bn_div.c b/crypto/bn/bn_div.c
index 7bee1dcc72..bbd0994008 100644
--- a/crypto/bn/bn_div.c
+++ b/crypto/bn/bn_div.c
@@ -342,9 +342,13 @@ int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
 		}
 	if (rm != NULL)
 		{
+		/* Keep a copy of the neg flag in num because if rm==num
+		 * BN_rshift() will overwrite it.
+		 */
+		int neg = num->neg;
 		BN_rshift(rm,snum,norm_shift);
 		if (!BN_is_zero(rm))
-			rm->neg = num->neg;
+			rm->neg = neg;
 		}
 	BN_CTX_end(ctx);
 	return(1);