From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 22 Jun 2026 09:01:31 +0000 (+0200)
Subject: 7.0-stable patches
X-Git-Tag: v6.18.37~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=747cdb8270086f3f30aa71c6d643edacad0caafc;p=thirdparty%2Fkernel%2Fstable-queue.git

7.0-stable patches

added patches:
	fuse-re-lock-request-before-replacing-page-cache-folio.patch
---

diff --git a/queue-7.0/fuse-re-lock-request-before-replacing-page-cache-folio.patch b/queue-7.0/fuse-re-lock-request-before-replacing-page-cache-folio.patch
new file mode 100644
index 0000000000..47737cfaf9
--- /dev/null
+++ b/queue-7.0/fuse-re-lock-request-before-replacing-page-cache-folio.patch
@@ -0,0 +1,67 @@
+From a078484921052d0badd827fcc2770b5cfc1d4120 Mon Sep 17 00:00:00 2001
+From: Joanne Koong <joannelkoong@gmail.com>
+Date: Mon, 18 May 2026 22:28:06 -0700
+Subject: fuse: re-lock request before replacing page cache folio
+
+From: Joanne Koong <joannelkoong@gmail.com>
+
+commit a078484921052d0badd827fcc2770b5cfc1d4120 upstream.
+
+fuse_try_move_folio() unlocks the request on entry but does not
+re-lock it on the success path. This means fuse_chan_abort() can end the
+request and free the fuse_io_args (eg fuse_readpages_end()) while the
+subsequent copy chain logic after fuse_try_move_folio() accesses the
+fuse_io_args, leading to use-after-free issues.
+
+Fix this by calling lock_request() before replace_page_cache_folio().
+This ensures the request is locked on the success path which will
+prevent the fuse_io_args from being freed while the later copying logic
+runs, and also ensures that the ap->folios[i]->mapping is never null
+since ap->folios[i] will always point to the newfolio after
+replace_page_cache_folio().
+
+Fixes: ce534fb05292 ("fuse: allow splice to move pages")
+Cc: stable@vger.kernel.org
+Reported-by: Lei Lu <llfamsec@gmail.com>
+Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
+Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/fuse/dev.c |   19 +++++--------------
+ 1 file changed, 5 insertions(+), 14 deletions(-)
+
+--- a/fs/fuse/dev.c
++++ b/fs/fuse/dev.c
+@@ -1037,6 +1037,10 @@ static int fuse_try_move_folio(struct fu
+ 	if (WARN_ON(folio_test_mlocked(oldfolio)))
+ 		goto out_fallback_unlock;
+ 
++	err = lock_request(cs->req);
++	if (err)
++		goto out_fallback_unlock;
++
+ 	replace_page_cache_folio(oldfolio, newfolio);
+ 
+ 	folio_get(newfolio);
+@@ -1050,20 +1054,7 @@ static int fuse_try_move_folio(struct fu
+ 	 */
+ 	pipe_buf_release(cs->pipe, buf);
+ 
+-	err = 0;
+-	spin_lock(&cs->req->waitq.lock);
+-	if (test_bit(FR_ABORTED, &cs->req->flags))
+-		err = -ENOENT;
+-	else
+-		*foliop = newfolio;
+-	spin_unlock(&cs->req->waitq.lock);
+-
+-	if (err) {
+-		folio_unlock(newfolio);
+-		folio_put(newfolio);
+-		goto out_put_old;
+-	}
+-
++	*foliop = newfolio;
+ 	folio_unlock(oldfolio);
+ 	/* Drop ref for ap->pages[] array */
+ 	folio_put(oldfolio);
diff --git a/queue-7.0/series b/queue-7.0/series
index 1940111452..bb6f1e3399 100644
--- a/queue-7.0/series
+++ b/queue-7.0/series
@@ -6,3 +6,4 @@ firmware-exynos-acpm-count-acpm_xfer-buffers-with-__counted_by_ptr.patch
 firmware-samsung-acpm-fix-cross-thread-rx-length-corruption.patch
 firmware-samsung-acpm-fix-false-timeouts-and-use-after-free-in-polling.patch
 firmware-samsung-acpm-fix-missing-lkmm-barriers-in-sequence-allocator.patch
+fuse-re-lock-request-before-replacing-page-cache-folio.patch