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cifs: revalidate mapping when we open files for SMB1 POSIX

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[ Upstream commit cee8f4f6fc ]

RHBZ: 1933527

Under SMB1 + POSIX, if an inode is reused on a server after we have read and
cached a part of a file, when we then open the new file with the
re-cycled inode there is a chance that we may serve the old data out of cache
to the application.
This only happens for SMB1 (deprecated) and when posix are used.
The simplest solution to avoid this race is to force a revalidate
on smb1-posix open.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ronnie Sahlberg 2021-03-25 16:26:35 +10:00 committed by Greg Kroah-Hartman
parent 42498ee672
commit fee111089c
1 changed files with 1 additions and 0 deletions
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fs/cifs/file.c
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@ -164,6 +164,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
goto posix_open_ret;
}
} else {
cifs_revalidate_mapping(*pinode);
cifs_fattr_to_inode(*pinode, &fattr);
}