From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DFEB2318ED6; Tue, 21 Jul 2026 20:26:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665584; cv=none; b=FAgxqvN1WgIb6jxjzBBxke+cAzUWFt+rKKML0JO2qO9U2/u1lKE87/n+OzxZ+GuFce1dhH8sJwvtQSwNS89riuj6y1TGB5+FSuR3Ycxm75lP6N1oGy5KjeudFI30KE4Vf+Lai//GIz8RBuEkHTczBh+FIRvDeAPDhfXrW0Nyh3E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665584; c=relaxed/simple; bh=7pJvObSHLiatt3WgiWbJDn5JazYubni1C95KQQQWmiM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b81YZiKl35A5o3CNlsfd+xhC7EiSJ4bVol/niXqfKuglNzfOB6Zz+UrXo1pazNQefk9+ENpT+NvjCNeglsg/eNgjigs8UPEzJMti2/fGlBrCj16fEd4MPT6DNgrBB13IOHiuoSEktgwb6SRVSf+GE3qgUexqvRBI6F6dQTv2LQ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=q9PDzXz6; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="q9PDzXz6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 193031F000E9; Tue, 21 Jul 2026 20:26:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784665583; bh=xvlJX5GEmDxkiDjF+d+WjyJyf/MX7xf/hXGiJ+6qFr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=q9PDzXz6nDCDXqmg+YBOQ/WNOa77Bswuzag2v8R3uVkyB2/822ys8aefzaopFMtSV Wu4b7jc8s5NF24KPK86vebAFJESwavq86uTfMfNz9CJxI1UwJNjm1MaAC6Tg2h8T07 kdY/yQdtiiI7t4sMWb8YxnyAuLajiF2ibRMnb2nc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Joanne Koong , Miklos Szeredi Subject: [PATCH 6.6 0322/1266] fuse: re-lock request before returning from fuse_ref_folio() Date: Tue, 21 Jul 2026 17:12:39 +0200 Message-ID: <20260721152449.041652688@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joanne Koong commit b5befa80fdbe287a98480effed9564712924add5 upstream. fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning. Fixes: c3021629a0d8 ("fuse: support splice() reading from fuse device") Cc: stable@vger.kernel.org Signed-off-by: Joanne Koong Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -912,7 +912,7 @@ static int fuse_ref_page(struct fuse_cop cs->nr_segs++; cs->len = 0; - return 0; + return lock_request(cs->req); } /*