linux-kernel - [PATCH 3.16 106/346] radix-tree: fix radix_tree_iter

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Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Ross Zwisler" <ross.zwisler@...ux.intel.com>,
        "Dmitry Vyukov" <dvyukov@...gle.com>,
        "Andrey Ryabinin" <aryabinin@...tuozzo.com>,
        "Matthew Wilcox" <willy@...ux.intel.com>,
        "Hugh Dickins" <hughd@...gle.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Konstantin Khlebnikov" <koct9i@...il.com>
Subject: [PATCH 3.16 106/346] radix-tree: fix radix_tree_iter_retry() for
 tagged iterators.

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Andrey Ryabinin <aryabinin@...tuozzo.com>

commit 3cb9185c67304b2a7ea9be73e7d13df6fb2793a1 upstream.

radix_tree_iter_retry() resets slot to NULL, but it doesn't reset tags.
Then NULL slot and non-zero iter.tags passed to radix_tree_next_slot()
leading to crash:

  RIP: radix_tree_next_slot include/linux/radix-tree.h:473
    find_get_pages_tag+0x334/0x930 mm/filemap.c:1452
  ....
  Call Trace:
    pagevec_lookup_tag+0x3a/0x80 mm/swap.c:960
    mpage_prepare_extent_to_map+0x321/0xa90 fs/ext4/inode.c:2516
    ext4_writepages+0x10be/0x2b20 fs/ext4/inode.c:2736
    do_writepages+0x97/0x100 mm/page-writeback.c:2364
    __filemap_fdatawrite_range+0x248/0x2e0 mm/filemap.c:300
    filemap_write_and_wait_range+0x121/0x1b0 mm/filemap.c:490
    ext4_sync_file+0x34d/0xdb0 fs/ext4/fsync.c:115
    vfs_fsync_range+0x10a/0x250 fs/sync.c:195
    vfs_fsync fs/sync.c:209
    do_fsync+0x42/0x70 fs/sync.c:219
    SYSC_fdatasync fs/sync.c:232
    SyS_fdatasync+0x19/0x20 fs/sync.c:230
    entry_SYSCALL_64_fastpath+0x23/0xc1 arch/x86/entry/entry_64.S:207

We must reset iterator's tags to bail out from radix_tree_next_slot()
and go to the slow-path in radix_tree_next_chunk().

Fixes: 46437f9a554f ("radix-tree: fix race in gang lookup")
Link: http://lkml.kernel.org/r/1468495196-10604-1-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Acked-by: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Matthew Wilcox <willy@...ux.intel.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/radix-tree.h | 1 +
 1 file changed, 1 insertion(+)

--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -382,6 +382,7 @@ static inline __must_check
 void **radix_tree_iter_retry(struct radix_tree_iter *iter)
 {
 	iter->next_index = iter->index;
+	iter->tags = 0;
 	return NULL;
 }