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1f977e77f5
All public API functions in `src/agent.c` that take a `LIBSSH2_AGENT *` were missing a NULL-pointer check at entry. A caller that passes NULL (for example, after `libssh2_agent_init()` returns NULL due to OOM) immediately dereferences the null pointer and crashes. Every other source file in this tree already has the pattern: `channel.c`, `sftp.c`, `session.c`, `userauth.c`, and `knownhost.c` all guard their primary handle before touching any field. `agent.c` was the only outlier. Add `if(!agent)` guards consistent with the style used in the rest of the codebase. Closes #2635
libssh2 - SSH2 library
libssh2 is a library implementing the SSH2 protocol, available under the revised BSD license.
Installation instructions: