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doc: clarify SSL_CIPHER_description allocation

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Previously the documentation for `SSL_CIPHER_description` said:
> If buf is provided, it must be at least 128 bytes, otherwise a buffer
> will be allocated using OPENSSL_malloc().

In reality, `OPENSSL_malloc` is only invoked if the provided `buf`
argument is `NULL`. If the `buf` arg is not `NULL`, but smaller than
128 bytes, the function returns `NULL` without attempting to allocate
a new buffer for the description.

This commit adjusts the documentation to better describe the implemented
behaviour.

CLA: trivial

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23921)
This commit is contained in:
Daniel McCarney 2024-03-21 15:41:11 -04:00 committed by Tomas Mraz
parent 58ffcbbdc3
commit 6a4a714045
1 changed files with 1 additions and 1 deletions
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doc/man3/SSL_CIPHER_get_name.pod
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@ -109,7 +109,7 @@ cipher B<c>.
SSL_CIPHER_description() returns a textual description of the cipher used
into the buffer B<buf> of length B<len> provided. If B<buf> is provided, it
must be at least 128 bytes, otherwise a buffer will be allocated using
must be at least 128 bytes. If B<buf> is NULL it will be allocated using
OPENSSL_malloc(). If the provided buffer is too small, or the allocation fails,
B<NULL> is returned.