Re: [PATCH 4/4] worktree: handle broken symrefs in find_shared_symref()

> The refs_resolve_ref_unsafe() function may return NULL even
> with a REF_ISSYMREF flag if a symref points to a broken ref.
> As a result, it's possible for find_shared_symref() to
> segfault when it passes NULL to strcmp().
> [...]
> We can fix this by treating NULL the same as a non-matching
> symref. Arguably we'd prefer to tell know if a symref points

> to "refs/heads/foo", but "refs/heads/foo" is broken. But
> refs_resolve_ref_unsafe() isn't capable of giving us that
> information, so this is the best we can do.
>
> Signed-off-by: Jeff King <peff@peff.net>