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"