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- Make sure the new futex phash is not copied during fork in order to

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avoid a double-free
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Merge tag 'locking_urgent_for_v6.16_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking fix from Borislav Petkov:

 - Make sure the new futex phash is not copied during fork in order to
   avoid a double-free

* tag 'locking_urgent_for_v6.16_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Initialize futex_phash_new during fork().
This commit is contained in:
Linus Torvalds 2025-06-29 08:09:13 -07:00
commit 753a0f61b9
1 changed files with 1 additions and 0 deletions
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1
include/linux/futex.h
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@ -89,6 +89,7 @@ void futex_hash_free(struct mm_struct *mm);
static inline void futex_mm_init(struct mm_struct *mm)
{
RCU_INIT_POINTER(mm->futex_phash, NULL);
mm->futex_phash_new = NULL;
mutex_init(&mm->futex_hash_lock);
}