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Description: mm: fix pin vs. gup mismatch with gate pages
References:
 https://www.openwall.com/lists/oss-security/2020/09/08/4
Notes:
 carnil> Issue introduced with 3faa52c03f44 ("mm/gup: track FOLL_PIN
 carnil> pages") in 5.7-rc1.
Bugs:
upstream: released (5.9-rc4) [9fa2dd946743ae6f30dc4830da19147bf100a7f2]
4.19-upstream-stable: N/A "Vulnerable code introduced later"
4.9-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (5.8.7-1)
4.19-buster-security: N/A "Vulnerable code introduced later"
4.9-stretch-security: N/A "Vulnerable code introduced later"

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