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Sun, 17 May 2026 12:03:41 -0700 (PDT) From: Muhammad Bilal To: pmenzel@molgen.mpg.de Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, luiz.dentz@gmail.com, johan.hedberg@gmail.com, stable@vger.kernel.org Subject: Re: [PATCH] Bluetooth: SMP: add missing skb len check in smp_cmd_keypress_notify Date: Sun, 17 May 2026 15:03:12 -0400 Message-ID: <20260517190312.56076-1-meatuni001@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <860987c6-5a8a-4409-8943-0cba9d3cc2e1@molgen.mpg.de> References: <20260517145417.31910-1-meatuni001@gmail.com> <3a7eaf6e-6e4e-42b1-a136-3ed2befa90e2@molgen.mpg.de> <20260517180832.52329-1-meatuni001@gmail.com> <860987c6-5a8a-4409-8943-0cba9d3cc2e1@molgen.mpg.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Paul, There is no safe way to access kp->value in the truncated case, since the payload is not guaranteed to be present when skb->len < sizeof(*kp). If diagnostic information is still useful, only metadata can be logged: if (skb->len < sizeof(*kp)) { bt_dev_dbg(conn->hcon->hdev, "truncated keypress notify, len=%u", skb->len); return SMP_INVALID_PARAMS; } This keeps visibility into malformed packets without touching unvalidated memory. Happy to send a v2 if that looks good to you. Regards, Muhammad Bilal