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Change the semantics of OSSL_LIB_CTX_set0_default() NULL handling

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Change things so that passing NULL to OSSL_LIB_CTX_set0_default() means
keep the current library context unchanged.

This has the advantage of simplifying error handling, e.g. you can call
OSSL_LIB_CTX_set0_default in an error/finalisation block safe in the
knowledge the if the "prevctx" was never set then it will be a no-op (like
calling a "free" function with NULL).

Fixes #14593

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14890)
This commit is contained in:
Matt Caswell 2021-04-15 16:46:35 +01:00
parent 145a4c871d
commit 92b20fb8f7
2 changed files with 7 additions and 3 deletions
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6
crypto/context.c
View File

@ -204,9 +204,11 @@ OSSL_LIB_CTX *OSSL_LIB_CTX_set0_default(OSSL_LIB_CTX *libctx)
#ifndef FIPS_MODULE
OSSL_LIB_CTX *current_defctx;
if ((current_defctx = get_default_context()) != NULL
&& set_default_context(libctx))
if ((current_defctx = get_default_context()) != NULL) {
if (libctx != NULL)
set_default_context(libctx);
return current_defctx;
}
#endif
return NULL;

4
doc/man3/OSSL_LIB_CTX.pod
View File

@ -41,7 +41,9 @@ default OpenSSL library context.
OSSL_LIB_CTX_set0_default() sets the default OpenSSL library context to be
I<ctx> in the current thread. The previous default library context is
returned. Care should be taken by the caller to restore the previous
default library context with a subsequent call of this function.
default library context with a subsequent call of this function. If I<ctx> is
NULL then no change is made to the default library context, but a pointer to
the current library context is still returned.
Care should be taken when changing the default library context and starting
async jobs (see L<ASYNC_start_job(3)>), as the default library context when