Check t too.
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@ -1028,6 +1028,8 @@ int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
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assert(j <= al || j <= bl);
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k = j+j;
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t = BN_CTX_get(ctx);
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if (t == NULL)
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goto err;
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if (al > j || bl > j)
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{
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bn_wexpand(t,k*4);
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