4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Laura Abbott <[email protected]> commit e4e179a844f52e907e550f887d0a2171f1508af1 upstream. Syzbot reported a warning with Ion: WARNING: CPU: 0 PID: 3502 at drivers/staging/android/ion/ion-ioctl.c:73 ion_ioctl+0x2db/0x380 drivers/staging/android/ion/ion-ioctl.c:73 Kernel panic - not syncing: panic_on_warn set ... This is a warning that validation of the ioctl fields failed. This was deliberately added as a warning to make it very obvious to developers that something needed to be fixed. In reality, this is overkill and disturbs fuzzing. Switch to pr_warn for a message instead. Reported-by: [email protected] Reported-by: syzbot <[email protected]> Signed-off-by: Laura Abbott <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/staging/android/ion/ion-ioctl.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/staging/android/ion/ion-ioctl.c +++ b/drivers/staging/android/ion/ion-ioctl.c @@ -71,8 +71,10 @@ long ion_ioctl(struct file *filp, unsign return -EFAULT; ret = validate_ioctl_arg(cmd, &data); - if (WARN_ON_ONCE(ret)) + if (ret) { + pr_warn_once("%s: ioctl validate failed\n", __func__); return ret; + } if (!(dir & _IOC_WRITE)) memset(&data, 0, sizeof(data));
