patch: strip paths in leaked git patchmeta objects

mercurial/patch.py

@@ -907,7 +907,6 b' def parsefilename(str):'
             return s
     return s[:i]
 
-def selectfile(afile_orig, bfile_orig, hunk, strip):
     def pathstrip(path, strip):
         pathlen = len(path)
         i = 0
@@ -926,6 +925,7 b' def selectfile(afile_orig, bfile_orig, h'
             count -= 1
         return path[:i].lstrip(), path[i:].rstrip()
 
+def selectfile(afile_orig, bfile_orig, hunk, strip):
     nulla = afile_orig == "/dev/null"
     nullb = bfile_orig == "/dev/null"
     abase, afile = pathstrip(afile_orig, strip)
@@ -1190,6 +1190,9 b' def _applydiff(ui, fp, patcher, copyfn, '
                 continue
         elif state == 'git':
             for gp in values:
+                gp.path = pathstrip(gp.path, strip - 1)[1]
+                if gp.oldpath:
+                    gp.oldpath = pathstrip(gp.oldpath, strip - 1)[1]
                 if gp.op in ('COPY', 'RENAME'):
                     copyfn(gp.oldpath, gp.path, cwd)
                 changed[gp.path] = gp