Memory leak in DIGEST-MD5 plugin?

[Ken Murchison]

Patch applied to git.  Thanks!


On 06/10/2016 04:43 PM, Spencer Jackson via Cyrus-sasl wrote:
> Hi, while doing some work with Address Sanitizer, I noticed what 
> appears to be a memory leak in the DIGEST-MD5 client mechanism.
>
> In digestmd5_client_mech_step1, on line 4257, is seems that the 
> mechanism may allocate a new string on text->realm.
>
> Then, in digestmd5_client_mech_step2 on line 4333, it seems that 
> text->realm can be replaced by a realm obtained from the server. But, 
> if this memory was allocated on line 4257, then it seems that it is 
> never freed.
>
> Line numbers taken from current master at commit 
> 76dd88987eb7a916cc56585ccf38232c646483d8.
>
> Adding the line
> if (text->realm) params->utils->free(text->realm);
> to digestmd5_client_mech_step2 before setting the realm seems to have 
> addressed the issues raised by Address Sanitizer for me.
>
> Does this look legitimate?
>
> Spencer

-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University