[to-be-updated] aio-fix-mremap-after-fork-null-deref.patch removed from -mm tree

[to-be-updated] 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 an updated version will be merged

------------------------------------------------------
From: Seth Jenkins <sethjenkins@google.com>
Subject: aio: fix mremap after fork null-deref
Date: Fri, 4 Nov 2022 17:25:19 -0400

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.

Link: https://lkml.kernel.org/r/20221104212519.538108-1-sethjenkins@google.com
Fixes: e4a0d3e720e7 ("aio: Make it possible to remap aio ring")
Signed-off-by: Seth Jenkins <sethjenkins@google.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>
---

 fs/aio.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/fs/aio.c~aio-fix-mremap-after-fork-null-deref
+++ a/fs/aio.c
@@ -361,16 +361,18 @@ static int aio_ring_mremap(struct vm_are
 	spin_lock(&mm->ioctx_lock);
 	rcu_read_lock();
 	table = rcu_dereference(mm->ioctx_table);
-	for (i = 0; i < table->nr; i++) {
-		struct kioctx *ctx;
+	if (table) {
+		for (i = 0; i < table->nr; i++) {
+			struct kioctx *ctx;
 
-		ctx = rcu_dereference(table->table[i]);
-		if (ctx && ctx->aio_ring_file == file) {
-			if (!atomic_read(&ctx->dead)) {
-				ctx->user_id = ctx->mmap_base = vma->vm_start;
-				res = 0;
+			ctx = rcu_dereference(table->table[i]);
+			if (ctx && ctx->aio_ring_file == file) {
+				if (!atomic_read(&ctx->dead)) {
+					ctx->user_id = ctx->mmap_base = vma->vm_start;
+					res = 0;
+				}
+				break;
 			}
-			break;
 		}
 	}
 
_

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