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Fri, 11 Sep 2026 14:31:46 -0700 (PDT) Received: from ryzen.lan ([2601:644:8000:7a86::e35]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39da6016718sm4261752a91.15.2026.09.11.14.31.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2026 14:31:45 -0700 (PDT) From: Rosen Penev To: linux-wireless@vger.kernel.org Cc: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , linux-kernel@vger.kernel.org (open list) Subject: [PATCHv2 ath-next] wifi: ath9k: delete channel-context timers on deinit Date: Fri, 11 Sep 2026 14:31:44 -0700 Message-ID: <20260911213144.130192-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ath9k_deinit_channel_context() cancels chanctx_work but does not delete the offchannel and sched timers set up by ath9k_init_channel_context(). If either timer fires after deinit (e.g. during driver unload or suspend), it accesses sc->sc_ah which may already be freed by ath9k_hw_deinit(), causing a use-after-free. Delete both timers with timer_shutdown_sync() before cancelling the work item. Assisted-by: LLM Signed-off-by: Rosen Penev --- v2: use timer_shutdown_sync() drivers/net/wireless/ath/ath9k/channel.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c index 8b27d8cc086a..cfb1c90eb4b6 100644 --- a/drivers/net/wireless/ath/ath9k/channel.c +++ b/drivers/net/wireless/ath/ath9k/channel.c @@ -1363,6 +1363,8 @@ void ath9k_init_channel_context(struct ath_softc *sc) void ath9k_deinit_channel_context(struct ath_softc *sc) { + timer_shutdown_sync(&sc->sched.timer); + timer_shutdown_sync(&sc->offchannel.timer); cancel_work_sync(&sc->chanctx_work); } -- 2.55.0