git -- gitattributes parsing integer overflow

git team reports:

gitattributes are used to define unique attributes corresponding
to paths in your repository. These attributes are defined by
.gitattributes file(s) within your repository.
The parser used to read these files has multiple integer
overflows, which can occur when parsing either a large number
of patterns, a large number of attributes, or attributes with
overly-long names.
These overflows may be triggered via a malicious
.gitattributes file. However, Git automatically splits lines at
2KB when reading .gitattributes from a file, but not when parsing
it from the index. Successfully exploiting this vulnerability
depends on the location of the .gitattributes file in question.
This integer overflow can result in arbitrary heap reads
and writes, which may result in remote code execution.