The primary evidence comes from the bug report on Savannah (bug #53133) for GNU patch. The report includes a stack trace from AddressSanitizer that pinpoints the double free to the function 'another_hunk' in 'src/pch.c'. The vulnerability description also explicitly names 'another_hunk' as the location of the double free. Although a commit ID for the fix (9c986353e4) is mentioned, attempts to fetch the commit details failed. Therefore, the analysis relies on the textual information and stack trace provided in the bug report. The function 'main' is also in the stack trace as a caller of 'another_hunk', but the vulnerability itself (the double free operation) is located within 'another_hunk'.
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