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    Subject[ 052/123] nfs: fix null checking in nfs_get_option_str()
    Date
    3.7-stable review patch.  If anyone has any objections, please let me know.

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

    From: Xi Wang <xi.wang@gmail.com>

    commit e25fbe380c4e3c09afa98bcdcd9d3921443adab8 upstream.

    The following null pointer check is broken.

    *option = match_strdup(args);
    return !option;

    The pointer `option' must be non-null, and thus `!option' is always false.
    Use `!*option' instead.

    The bug was introduced in commit c5cb09b6f8 ("Cleanup: Factor out some
    cut-and-paste code.").

    Signed-off-by: Xi Wang <xi.wang@gmail.com>
    Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/nfs/super.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/nfs/super.c
    +++ b/fs/nfs/super.c
    @@ -1150,7 +1150,7 @@ static int nfs_get_option_str(substring_
    {
    kfree(*option);
    *option = match_strdup(args);
    - return !option;
    + return !*option;
    }

    static int nfs_get_option_ul(substring_t args[], unsigned long *option)



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