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    Subject[PATCH 4.5 158/238] quota: Fix possible GPF due to uninitialised pointers
    Date
    4.5-stable review patch.  If anyone has any objections, please let me know.

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

    From: Nikolay Borisov <kernel@kyup.com>

    commit ab73ef46398e2c0159f3a71de834586422d2a44a upstream.

    When dqget() in __dquot_initialize() fails e.g. due to IO error,
    __dquot_initialize() will pass an array of uninitialized pointers to
    dqput_all() and thus can lead to deference of random data. Fix the
    problem by properly initializing the array.

    Signed-off-by: Nikolay Borisov <kernel@kyup.com>
    Signed-off-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/quota/dquot.c | 3 +--
    1 file changed, 1 insertion(+), 2 deletions(-)

    --- a/fs/quota/dquot.c
    +++ b/fs/quota/dquot.c
    @@ -1398,7 +1398,7 @@ static int dquot_active(const struct ino
    static int __dquot_initialize(struct inode *inode, int type)
    {
    int cnt, init_needed = 0;
    - struct dquot **dquots, *got[MAXQUOTAS];
    + struct dquot **dquots, *got[MAXQUOTAS] = {};
    struct super_block *sb = inode->i_sb;
    qsize_t rsv;
    int ret = 0;
    @@ -1415,7 +1415,6 @@ static int __dquot_initialize(struct ino
    int rc;
    struct dquot *dquot;

    - got[cnt] = NULL;
    if (type != -1 && cnt != type)
    continue;
    /*

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