Description: NFSD: Fix exposure in nfsd4_decode_bitmap()
References:
 https://lore.kernel.org/linux-nfs/97860.1636837122@crash.local/
 https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit@klimt.1015granger.net/
Notes:
 carnil> Commit fixes d1c263a031e8 ("NFSD: Replace READ* macros in
 carnil> nfsd4_decode_fattr()") 5.15-rc1.
Bugs:
upstream: released (5.16-rc2) [c0019b7db1d7ac62c711cda6b357a659d46428fe]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
4.9-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.15.5-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"