diff options
| -rw-r--r-- | kernel/futex_compat.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c index 7e52eb051f2..589b1e427b7 100644 --- a/kernel/futex_compat.c +++ b/kernel/futex_compat.c @@ -29,6 +29,15 @@ fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry, return 0; } +static void __user *futex_uaddr(struct robust_list *entry, + compat_long_t futex_offset) +{ + compat_uptr_t base = ptr_to_compat(entry); + void __user *uaddr = compat_ptr(base + futex_offset); + + return uaddr; +} + /* * Walk curr->robust_list (very carefully, it's a userspace list!) * and mark any locks found there dead, and notify any waiters. @@ -61,18 +70,23 @@ void compat_exit_robust_list(struct task_struct *curr) if (fetch_robust_entry(&upending, &pending, &head->list_op_pending, &pip)) return; - if (pending) - handle_futex_death((void __user *)pending + futex_offset, curr, pip); + if (pending) { + void __user *uaddr = futex_uaddr(pending, + futex_offset); + handle_futex_death(uaddr, curr, pip); + } while (entry != (struct robust_list __user *) &head->list) { /* * A pending lock might already be on the list, so * dont process it twice: */ - if (entry != pending) - if (handle_futex_death((void __user *)entry + futex_offset, - curr, pi)) + if (entry != pending) { + void __user *uaddr = futex_uaddr(entry, + futex_offset); + if (handle_futex_death(uaddr, curr, pi)) return; + } /* * Fetch the next entry in the list: |