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Tue, 26 May 2026 21:49:29 -0700 (PDT) Received: from [127.0.0.1] ([116.80.91.208]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2beb58dba7bsm135704105ad.66.2026.05.26.21.49.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 21:49:28 -0700 (PDT) From: Cunlong Li Subject: [PATCH v2 0/2] zram: fix UAF in zram_bvec_write_partial() and drop dead bio plumbing Date: Wed, 27 May 2026 12:49:23 +0800 Message-Id: <20260527-zram-v2-0-2fb84b054b5c@gmail.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIANN3FmoC/zXMQQ7CIBCF4as0sxYDE0ujK+9hugAc2kmkGDBEb bi7WOPyf3n5VsiUmDKcuhUSFc4clxa468DNZplI8LU1oEQte9TinUwQVqoD9nYg7TS06z2R5+f GXMbWM+dHTK9NLeq7/oHhBxQllHCkjLNovfHH8xQM3/YuBhhrrR8t8VD0mAAAAA== X-Change-ID: 20260526-zram-b01425b7e6c6 To: Minchan Kim , Sergey Senozhatsky , Jens Axboe , Andrew Morton Cc: Christoph Hellwig , linux-block@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Cunlong Li , stable@vger.kernel.org X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779857366; l=1050; i=shenxiaogll@gmail.com; s=20260517; h=from:subject:message-id; bh=MWXxtYUJHKCFAwaYN7w+xkzs9tEH+b5cbl78IjB6IzQ=; b=awVJ3Reynx/9qKcpkry8pPVO6WO/SxEC+sbgYlB/AXjE7b9wokupd/75eZl2DJa0r9X5EKc89 efYJzuJECK2DHFqkFpgYD8dIqvHv2XslkX3RsXOW5OSU8b65Aik3V+A X-Developer-Key: i=shenxiaogll@gmail.com; a=ed25519; pk=SKFifnqPdsvsjuhUiq+Y9vtCdhyZ/LrRcfYn8eRq6AE= Patch 1 fixes a use-after-free in zram_bvec_write_partial() that happens on PAGE_SIZE > 4K configurations when a partial write hits a ZRAM_WB slot. Patch 2 is a follow-up cleanup that drops the now-unused bio parameter from zram_bvec_write_partial() and zram_bvec_write(), no functional change. Patch 1 is tagged for stable; patch 2 is not. Signed-off-by: Cunlong Li --- Changes in v2: - Add patch 2: drop the now-unused bio parameter from zram_bvec_write_partial() and zram_bvec_write(), per Sergey's suggestion on v1. - Link to v1: https://lore.kernel.org/r/20260527-zram-v1-1-ce1acb2bfaf9@gmail.com --- Cunlong Li (2): zram: fix use-after-free in zram_bvec_write_partial() zram: drop unused bio parameter from write helpers drivers/block/zram/zram_drv.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- base-commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 change-id: 20260526-zram-b01425b7e6c6 Best regards, -- Cunlong Li