Used memdup_user function instead of kmalloc followed by copy_from_user. Also, handled return error using IS_ERR and PTR_ERR. Patch found using coccinelle.
Signed-off-by: Alexandru Gheorghiu <gheorghiuan...@gmail.com> --- drivers/ptp/ptp_chardev.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index 34a0c60..bd7a2ab 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -94,14 +94,9 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) break; case PTP_SYS_OFFSET: - sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL); - if (!sysoff) { - err = -ENOMEM; - break; - } - if (copy_from_user(sysoff, (void __user *)arg, - sizeof(*sysoff))) { - err = -EFAULT; + sysoff = memdup_user((void __user *)arg, sizeof(*sysoff)); + if (IS_ERR(sysoff)) { + err = PTR_ERR(sysoff); break; } if (sysoff->n_samples > PTP_MAX_SAMPLES) { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/