[openssl-dev] [openssl.org #4159] BUG ::: Null dereference in ssl3_free

[Srinivas Koripella via RT]

Description.

We are dereferencing s->s3 in ssl3_free without checking if s->s3 is null or not.

s->s3 can be null because of the below code path.

SSL_new--> ssl3_new/tls1_new (via s->method->ssl_new) which allocates s3 and assigns s->s3 if successful. If not s->s3 will remain null as we memset entire contents of s to zero on allocation in SSL_new.

However in SSL_new on return from the above s->method->ssl_new we go to err and call SSL_free which always calls s->method->ssl_free with us landing in ssl3_free with s->s3 as NULL.

The fix should be to check for s->s3 and retrun if it is NULL immediately in ssl3_free before dereferencing it.

Srinivas


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