Commit 6840f909 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle)
Browse files

pagevec: Initialise folio_batch->percpu_pvec_drained 



When UBSAN is enabled, it reports an invalid value in __pagevec_release()
when accessing pvec->percpu_pvec_drained, which is simply whatever
garbage was on the stack.  Initialise it when initialising the rest of
the folio_batch.

Fixes: 10331795 ("pagevec: Add folio_batch")
Reported-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Tested-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
parent 455e73a0

include/linux/pagevec.h

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ static_assert(offsetof(struct pagevec, pages) == 
static inline void folio_batch_init(struct folio_batch *fbatch)

{

	fbatch->nr = 0;

	fbatch->percpu_pvec_drained = false;

}



static inline unsigned int folio_batch_count(struct folio_batch *fbatch)