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pagevec: Initialise folio_batch->percpu_pvec_drained

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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: 10331795fb ("pagevec: Add folio_batch")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-13 16:44:19 -05:00
parent 455e73a07f
commit 6840f9094f
1 changed files with 1 additions and 0 deletions
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include/linux/pagevec.h
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@ -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)