4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Laura Abbott <labbott@xxxxxxxxxx>
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: syzbot+fa2d5f63ee5904a0115a@xxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -83,8 +83,10 @@ 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));