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    Subject[PATCH 3.10 27/62] Btrfs:__add_inode_ref: out of bounds memory read when looking for extended ref.
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

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

    From: Quentin Casasnovas <quentin.casasnovas@oracle.com>

    commit dd9ef135e3542ffc621c4eb7f0091870ec7a1504 upstream.

    Improper arithmetics when calculting the address of the extended ref could
    lead to an out of bounds memory read and kernel panic.

    Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
    Reviewed-by: David Sterba <dsterba@suse.cz>
    Signed-off-by: Chris Mason <clm@fb.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/btrfs/tree-log.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/btrfs/tree-log.c
    +++ b/fs/btrfs/tree-log.c
    @@ -943,7 +943,7 @@ again:
    base = btrfs_item_ptr_offset(leaf, path->slots[0]);

    while (cur_offset < item_size) {
    - extref = (struct btrfs_inode_extref *)base + cur_offset;
    + extref = (struct btrfs_inode_extref *)(base + cur_offset);

    victim_name_len = btrfs_inode_extref_name_len(leaf, extref);




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