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When `git_buf_sanitize` gets called, it converts a buffer with NULL content to be correctly initialized. This is done by pointing it to `git_buf__initbuf`. While the method's documentation states this clearly, it may also lead to the conclusion that it will do the same to buffers which do _not_ have NULL contents. Clarify behavior when passing a buffer with non-NULL contents, where `git_buf_sanitize` will ensure that the contents are `\0`-terminated.
pks-t
commented
Feb 13, 2017
| * | ||
| * @param out the buffer to fill | ||
| * @param out the buffer to fill; existing content will be | ||
| * overwritten |
The functions `git_commit_header_field` and `git_commit_extract_signature` both receive buffers used to hand back the results to the user. While these functions called `git_buf_sanitize` on these buffers, this is not the right thing to do, as it will simply initialize or zero-terminate passed buffers. As we want to overwrite contents, we instead have to call `git_buf_clear` to completely reset them.
When extracting a commit's signature, we first free the object and only afterwards put its signature contents into the result buffer. This works in most cases - the free'd object will normally be cached anyway, so we only end up decrementing its reference count without actually freeing its contents. But in some more exotic setups, where caching is disabled, this can definitly be a problem, as we might be the only instance currently holding a reference to this object. Fix this issue by first extracting the contents and freeing the object afterwards only.
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Some findings related to #4118