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lib/radix-tree.c: fix overflow in radix_tree_range_tag_if_tagged()

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When radix_tree_maxindex() is ~0UL, it can happen that scanning overflows
index and tree traversal code goes astray reading memory until it hits
unreadable memory.  Check for overflow and exit in that case.

Signed-off-by: Jan Kara <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jan Kara 2010-08-19 14:13:33 -07:00 • committed by Linus Torvalds
commit d5ed3a4af7
2 changed files with 6 additions and 2 deletions
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3
mm/page-writeback.c
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@ -836,7 +836,8 @@ void tag_pages_for_writeback(struct address_space *mapping,
spin_unlock_irq(&mapping->tree_lock);
WARN_ON_ONCE(tagged > WRITEBACK_TAG_BATCH);
cond_resched();
} while (tagged >= WRITEBACK_TAG_BATCH);
/* We check 'start' to handle wrapping when end == ~0UL */
} while (tagged >= WRITEBACK_TAG_BATCH && start);
}
EXPORT_SYMBOL(tag_pages_for_writeback);