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| author | Konstantin Khlebnikov <koct9i@gmail.com> | 2016-02-05 15:37:01 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-25 12:01:23 -0800 |
| commit | 55e0d9869f1d3a6bbd5d1e864c0e866fe1247f97 (patch) | |
| tree | bd12d95ca4b00351716460d6e6a3b98474d6af29 /lib | |
| parent | 077b6173a8c89d666a06203f42267ff8b6d02d73 (diff) | |
radix-tree: fix oops after radix_tree_iter_retry
commit 732042821cfa106b3c20b9780e4c60fee9d68900 upstream.
Helper radix_tree_iter_retry() resets next_index to the current index.
In following radix_tree_next_slot current chunk size becomes zero. This
isn't checked and it tries to dereference null pointer in slot.
Tagged iterator is fine because retry happens only at slot 0 where tag
bitmask in iter->tags is filled with single bit.
Fixes: 46437f9a554f ("radix-tree: fix race in gang lookup")
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Jeremiah Mahler <jmmahler@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions