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    Subject[PATCH 16/27] drivers/char/applicom.c: Use memdup_user
    From: Julia Lawall <julia@diku.dk>

    Use memdup_user when user data is immediately copied into the
    allocated region.

    The semantic patch that makes this change is as follows:
    (http://coccinelle.lip6.fr/)

    // <smpl>
    @@
    expression from,to,size,flag;
    position p;
    identifier l1,l2;
    @@

    - to = \(kmalloc@p\|kzalloc@p\)(size,flag);
    + to = memdup_user(from,size);
    if (
    - to==NULL
    + IS_ERR(to)
    || ...) {
    <+... when != goto l1;
    - -ENOMEM
    + PTR_ERR(to)
    ...+>
    }
    - if (copy_from_user(to, from, size) != 0) {
    - <+... when != goto l2;
    - -EFAULT
    - ...+>
    - }
    // </smpl>

    Signed-off-by: Julia Lawall <julia@diku.dk>

    ---
    drivers/char/applicom.c | 11 +++--------
    1 file changed, 3 insertions(+), 8 deletions(-)

    diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c
    index 63313a3..f4ae0e0 100644
    --- a/drivers/char/applicom.c
    +++ b/drivers/char/applicom.c
    @@ -703,14 +703,9 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
    /* In general, the device is only openable by root anyway, so we're not
    particularly concerned that bogus ioctls can flood the console. */

    - adgl = kmalloc(sizeof(struct st_ram_io), GFP_KERNEL);
    - if (!adgl)
    - return -ENOMEM;
    -
    - if (copy_from_user(adgl, argp, sizeof(struct st_ram_io))) {
    - kfree(adgl);
    - return -EFAULT;
    - }
    + adgl = memdup_user(argp, sizeof(struct st_ram_io));
    + if (IS_ERR(adgl))
    + return PTR_ERR(adgl);

    lock_kernel();
    IndexCard = adgl->num_card-1;

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