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Mon, 22 Jun 2026 23:36:49 -0700 (PDT) X-Received: by 2002:a05:6a00:3d56:b0:842:7476:2376 with SMTP id d2e1a72fcca58-845625b56fcmr13936106b3a.41.1782196609327; Mon, 22 Jun 2026 23:36:49 -0700 (PDT) Received: from [10.152.199.23] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84564d6c2d9sm13066301b3a.6.2026.06.22.23.36.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Jun 2026 23:36:48 -0700 (PDT) Message-ID: <89700bcd-150a-4730-a7f3-fb4ea2228689@oss.qualcomm.com> Date: Tue, 23 Jun 2026 12:06:42 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] wifi: ath6kl: fix use-after-free in aggr_reset_state() To: Daniel Hodges , linux-wireless@vger.kernel.org Cc: tglx@kernel.org, mingo@kernel.org, joe@perches.com, vthiagar@qca.qualcomm.com, rmani@qca.qualcomm.com, jouni@qca.qualcomm.com, kvalo@qca.qualcomm.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260206185207.30098-1-git@danielhodges.dev> From: Rameshkumar Sundaram Content-Language: en-US In-Reply-To: <20260206185207.30098-1-git@danielhodges.dev> Content-Type: text/plain; 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> > if (aggr_conn->timer_scheduled) { > - timer_delete(&aggr_conn->timer); > + timer_delete_sync(&aggr_conn->timer); > aggr_conn->timer_scheduled = false; > } > I am not familiar with ath6kl either, but while looking through the code, aggr_reset_state() still calls timer_delete_sync() only when aggr_conn->timer_scheduled is true. However aggr_timeout() clears timer_scheduled near the beginning of the callback, before it walks aggr_conn->rx_tid[] and updates aggr_conn->stat[]. So aggr_reset_state() can observe timer_scheduled == false while the timer callback is still running, skip timer_delete_sync(), and then delete the TID state / allow aggr_conn to be freed. That still leaves the UAF window open. I think timer_delete_sync() should be called unconditionally after the aggr_conn NULL check, and timer_scheduled can then be cleared afterwards. -- Ramesh