linux-kernel - [GIT pull] core/urgent for v5.18-rc6

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Date:   Sun,  8 May 2022 14:05:19 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] core/urgent for v5.18-rc6

Linus,

please pull the latest core/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-2022-05-08

up to:  2667ed10d9f0: mm: Fix PASID use-after-free issue


A single bugfix for the PASID management code, which freed the PASID too
early. The PASID needs to be tied to the mm lifetime, not to the address
space lifetime.

Thanks,

	tglx

------------------>
Fenghua Yu (1):
      mm: Fix PASID use-after-free issue


 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 9796897560ab..35a3beff140b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -792,6 +792,7 @@ void __mmdrop(struct mm_struct *mm)
 	mmu_notifier_subscriptions_destroy(mm);
 	check_mm(mm);
 	put_user_ns(mm->user_ns);
+	mm_pasid_drop(mm);
 	free_mm(mm);
 }
 EXPORT_SYMBOL_GPL(__mmdrop);
@@ -1190,7 +1191,6 @@ static inline void __mmput(struct mm_struct *mm)
 	}
 	if (mm->binfmt)
 		module_put(mm->binfmt->module);
-	mm_pasid_drop(mm);
 	mmdrop(mm);
 }