__dentry_path() fixes
commit f6500801 upstream. * we need to save the starting point for restarts * reject pathologically short buffers outright Spotted-by: Denys Vlasenko <dvlasenk@redhat.com> Spotted-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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