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Description: NFS client crash due to index buffer overflow during Direct IO write causing kernel panic
References:
https://bugzilla.redhat.com/show_bug.cgi?id=1835127
https://bugzilla.redhat.com/show_bug.cgi?id=1824270
https://bugzilla.suse.com/show_bug.cgi?id=1171984
Notes:
carnil> Needs to be checked if this specific to Red Hat or an upstream
carnil> issue.
carnil> Maybe related to 18aad3d552c7 ("NFSv4.1 Refactor
carnil> nfs4_init_session and nfs4_init_channel_attrs") [3.11-rc1] and
carnil> 68bf05efb7fa ("nfs41: fix session fore channel negotiation")
carnil> [2.6.33-rc1]?
carnil> Further analysis seem to show that the issue is introduced in
carnil> 1763da1234cb ("NFS: rewrite directio write to use async
carnil> coalesce code") and fixed with 91f79c43d1b5 ("new helper:
carnil> iov_iter_get_pages_alloc()").
Bugs:
upstream: released (3.16-rc1) [91f79c43d1b54d7154b118860d81b39bad07dfff]
4.19-upstream-stable: N/A "Fixed before branching point"
4.9-upstream-stable: N/A "Fixed before branching point"
3.16-upstream-stable: N/A "Fixed before branching point"
sid: released (3.16.2-2)
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: N/A "Fixed before branching point"
3.16-jessie-security: N/A "Fixed before branching point"
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