fuse: fix oops in revalidate when called with NULL nameidata
Some cases (e.g. ecryptfs) can call ->dentry_revalidate with NULL nameidata. https://bugzilla.kernel.org/show_bug.cgi?id=34732 Tyler Hicks pointed out that this bug was introduced by commit e7c0a167 "fuse: make fuse_dentry_revalidate() RCU aware" Reported-by: NWitold Baryluk <baryluk@smp.if.uj.edu.pl> Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
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