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Wed, 13 May 2026 22:02:27 +0800 (CST) From: wang wei To: richardycc@google.com Cc: akpm@linux-foundation.org, axboe@kernel.dk, bgeffon@google.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, liumartin@google.com, minchan@kernel.org, senozhatsky@chromium.org, stable@vger.kernel.org, wang wei Subject: [PATCH] Re:[PATCH v3] zram: fix use-after-free in zram_writeback_endio Date: Wed, 13 May 2026 22:02:18 +0800 Message-Id: <20260513140218.7425-1-a929244872@163.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260512074918.2606208-1-richardycc@google.com> References: <20260512074918.2606208-1-richardycc@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:QCgvCgDXniBxhARqrEiHDg--.29S2 X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73 VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvjTRPrcfUUUUU X-Originating-IP: [240e:390:c93:1a01:40fd:cd93:6bc:1818] X-CM-SenderInfo: jdzsmjiuuylji6rwjhhfrp/xtbC6hTZgGoEhHRf4wAA3F X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 746FC20027 X-Rspam-User: X-Stat-Signature: jsp84rqz3e4wkunujqic54nctsh1qgoz X-HE-Tag: 1778681001-282632 X-HE-Meta: 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 D6zNf3hV Snwv6ZbecrSS6nAA0WuHynosmhPsj1gMM+nXN9Qqxf0GA4ccOgH5QcqdWXxAzSfwnP8vqJTn4R9yXsHCZaOVznk5zS50Ma3FQtmFh1AVllkCY6bnLj6tVT0ww/P4ugdvyAkFWLSM8XcjBvHX3gHjKcfMvF5+YSKvAjOgDxs/lv0I59aZowRrmyKml1o9QZTo4UNh6J6gtZmLumaRd5E5LFGjx7cfuuwJMuzjnYow4oJoXp5DjAKrcV1yj3PZIe+BRRXIb1I2jYfU2Gxk+zMCegGdh4k5qrO0c+qO8lPmnkt0ntwX9soaFFOXMZqEdhoINqI0Cbzc4V1Ri0RJ1gA0Y08ZBLjwR8relu48T Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >@@ -847,7 +849,7 @@ static void release_wb_ctl(struct zram_wb_ctl *wb_ctl) > release_wb_req(req); > } > >- kfree(wb_ctl); >+ kfree_rcu(wb_ctl, rcu); > } Do we need to add a 'rcu_assign_pointer(wb_ctl, NULL);' before 'kfree_rcu(wb_ctl, rcu)'? Signed-off-by: wang wei -- 2.25.1