diff options
Diffstat (limited to 'drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c')
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c index ea789376de0f..45de21c210c1 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c @@ -1795,6 +1795,7 @@ vchiq_compat_ioctl_await_completion(struct file *file, struct vchiq_await_completion32 args32; struct vchiq_completion_data32 completion32; unsigned int *msgbufcount32; + unsigned int msgbufcount_native; compat_uptr_t msgbuf32; void *msgbuf; void **msgbufptr; @@ -1906,7 +1907,11 @@ vchiq_compat_ioctl_await_completion(struct file *file, sizeof(completion32))) return -EFAULT; - args32.msgbufcount--; + if (get_user(msgbufcount_native, &args->msgbufcount)) + return -EFAULT; + + if (!msgbufcount_native) + args32.msgbufcount--; msgbufcount32 = &((struct vchiq_await_completion32 __user *)arg)->msgbufcount; |