From: Peilin Ye <yepeilin...@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+34ee1b45d88571c2f...@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802 Reviewed-by: Dan Carpenter <dan.carpen...@oracle.com> Signed-off-by: Peilin Ye <yepeilin...@gmail.com> Signed-off-by: Jiri Kosina <jkos...@suse.cz> Signed-off-by: Greg Kroah-Hartman <gre...@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;
