[merged mm-hotfixes-stable] aio-fix-mremap-after-fork-null-deref.patch removed from -mm tree

[merged mm-hotfixes-stable] aio-fix-mremap-after-fork-null-deref.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: aio: fix mremap after fork null-deref
has been removed from the -mm tree.  Its filename was
     aio-fix-mremap-after-fork-null-deref.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Seth Jenkins <sethjenkins@google.com>
Subject: aio: fix mremap after fork null-deref
Date: Tue, 31 Jan 2023 12:25:55 -0500

Commit e4a0d3e720e7 ("aio: Make it possible to remap aio ring") introduced
a null-deref if mremap is called on an old aio mapping after fork as
mm->ioctx_table will be set to NULL.

[jmoyer@redhat.com: fix 80 column issue]
Link: https://lkml.kernel.org/r/x49sffq4nvg.fsf@segfault.boston.devel.redhat.com
Fixes: e4a0d3e720e7 ("aio: Make it possible to remap aio ring")
Signed-off-by: Seth Jenkins <sethjenkins@google.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Jann Horn <jannh@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/fs/aio.c~aio-fix-mremap-after-fork-null-deref
+++ a/fs/aio.c
@@ -361,6 +361,9 @@ static int aio_ring_mremap(struct vm_are
 	spin_lock(&mm->ioctx_lock);
 	rcu_read_lock();
 	table = rcu_dereference(mm->ioctx_table);
+	if (!table)
+		goto out_unlock;
+
 	for (i = 0; i < table->nr; i++) {
 		struct kioctx *ctx;
 
@@ -374,6 +377,7 @@ static int aio_ring_mremap(struct vm_are
 		}
 	}
 
+out_unlock:
 	rcu_read_unlock();
 	spin_unlock(&mm->ioctx_lock);
 	return res;
_

Patches currently in -mm which might be from sethjenkins@google.com are