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Check for 0 modulus in BN_RECP_CTX_set. #21255

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Check for 0 modulus in BN_RECP_CTX_set. #21255

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Commits on Jun 25, 2023

  1. Check for 0 modulus in BN_RECP_CTX_set. 

    The function BN_RECP_CTX_set did not check whether arg d is zero,
in which case an early failure should be returned to the invoker.
This is a similar fix to the cognate defect of CVE-2015-1794.

Fixes openssl#21111

CLA: trivial
    fullwaywang committed Jun 25, 2023
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