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    Subject[PATCH 5.4 212/214] HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
    Date
    From: Peilin Ye <yepeilin.cs@gmail.com>

    commit 25a097f5204675550afb879ee18238ca917cba7a upstream.

    `uref->usage_index` is not always being properly checked, causing
    hiddev_ioctl_usage() to go out of bounds under some cases. Fix it.

    Reported-by: syzbot+34ee1b45d88571c2fa8b@syzkaller.appspotmail.com
    Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802
    Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
    Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/hid/usbhid/hiddev.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/hid/usbhid/hiddev.c
    +++ b/drivers/hid/usbhid/hiddev.c
    @@ -519,12 +519,16 @@ static noinline int hiddev_ioctl_usage(s

    switch (cmd) {
    case HIDIOCGUSAGE:
    + if (uref->usage_index >= field->report_count)
    + goto inval;
    uref->value = field->value[uref->usage_index];
    if (copy_to_user(user_arg, uref, sizeof(*uref)))
    goto fault;
    goto goodreturn;

    case HIDIOCSUSAGE:
    + if (uref->usage_index >= field->report_count)
    + goto inval;
    field->value[uref->usage_index] = uref->value;
    goto goodreturn;


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