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There's a slight possibility that a is 0 in BN_sub_word(), and might
therefore have unallocated parts. Therefore, a check for the 0 case is needed, resulting with the same thing as when a is negative.
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@ -140,7 +140,7 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w)
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{
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int i;
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if (a->neg)
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if (BN_is_zero(a) || a->neg)
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{
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a->neg=0;
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i=BN_add_word(a,w);
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