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Fix error handling in bn_exp

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In the event of an error |rr| could be NULL. Therefore don't assume you can
use |rr| in the error handling code.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(cherry picked from commit 8c5a7b33c6269c3bd6bc0df6b4c22e4fba03b485)
This commit is contained in:
Matt Caswell 2015-03-11 15:31:16 +00:00
parent f5ee521307
commit cc27bec2b4
1 changed files with 2 additions and 2 deletions
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4
crypto/bn/bn_exp.c
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@ -168,10 +168,10 @@ int BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
goto err; goto err;
} }
} }
ret = 1;
err:
if (r != rr) if (r != rr)
BN_copy(r, rr); BN_copy(r, rr);
ret = 1;
err:
BN_CTX_end(ctx); BN_CTX_end(ctx);
bn_check_top(r); bn_check_top(r);
return (ret); return (ret);