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

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 <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 6 insertions, 2 deletions

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e907858498a6..5b7d4623f0b7 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -625,6 +625,8 @@ EXPORT_SYMBOL(radix_tree_tag_get);
  *
  * The function returns number of leaves where the tag was set and sets
  * *first_indexp to the first unscanned index.
+ * WARNING! *first_indexp can wrap if last_index is ULONG_MAX. Caller must
+ * be prepared to handle that.
  */
 unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
                 unsigned long *first_indexp, unsigned long last_index,
@@ -675,7 +677,8 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
 next:
                 /* Go to next item at level determined by 'shift' */
                 index = ((index >> shift) + 1) << shift;
-                if (index > last_index)
+                /* Overflow can happen when last_index is ~0UL... */
+                if (index > last_index || !index)
                         break;
                 if (tagged >= nr_to_tag)
                         break;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7262aacea8a2..c09ef5219cbe 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -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);