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김영민 reports that shstk_pop_sigframe() doesn't check for errors from mmap_read_lock_killable(), which is a silly oversight, and also shows that we haven't marked those functions with "__must_check", which would have immediately caught it. So let's fix both issues. Reported-by: 김영민 <osori@hspace.io> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Dave Hansen <dave.hansen@intel.com> Acked-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>