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由 Hugo Landau 提交于
This fixes a bug whereby BN_mod_exp2_mont can dereference a NULL pointer if BIGNUM argument m represents zero. Regression test added. Fixes #17648. Reviewed-by: NMatt Caswell <matt@openssl.org> Reviewed-by: NTomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17783)
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