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Tue, 01 Sep 2026 07:47:53 -0700 (PDT) From: Ren Wei To: oe-linux-nfc@lists.linux.dev, netdev@vger.kernel.org, horms@kernel.org Cc: david@ixit.cz, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, error27@gmail.com, kees@kernel.org, pengpeng@iscas.ac.cn, raoxu@uniontech.com, rosenp@gmail.com, dddddd@hust.edu.cn, joe@dama.to, ian.ray@gehealthcare.com, kuniyu@google.com, linma@zju.edu.cn, vega@nebusec.ai, rakukuip@gmail.com, weir@nebusec.ai Subject: [PATCH net v2 0/1] net: nfc: Fix use-after-free in general bytes retrieval Date: Tue, 1 Sep 2026 22:47:31 +0800 Message-ID: X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luxiao Xu Hi, This patch fixes a use-after-free (UAF) bug in nfc_get_local_general_bytes() where the local structure could be freed prematurely by nfc_llcp_local_put() before the returned pointer was accessed by callers. The fix refactors nfc_llcp_general_bytes() and nfc_get_local_general_bytes() to accept a caller-provided destination buffer and copies the general bytes safely before decrementing the reference count. Changes in v2: - Fix GCC -Waddress compiler warning in nfc_llcp_general_bytes() by removing the redundant nullness check on 'local->gb' array. - Fix line wrap indentation and column width across modified driver files to conform to the 80-column limit. v1 Link: https://lore.kernel.org/netdev/cover.1786029423.git.rakukuip@gmail.com/ Thanks, Ren Luxiao Xu Luxiao Xu (1): net: nfc: fix use-after-free in nfc_get_local_general_bytes drivers/nfc/microread/microread.c | 6 +++--- drivers/nfc/pn533/pn533.c | 14 ++++++++------ drivers/nfc/pn533/pn533.h | 2 +- drivers/nfc/pn544/pn544.c | 7 +++---- drivers/nfc/st21nfca/core.c | 8 ++++---- include/net/nfc/hci.h | 2 +- include/net/nfc/nfc.h | 3 ++- net/nfc/core.c | 15 +++++++-------- net/nfc/digital_dep.c | 8 ++++---- net/nfc/llcp_core.c | 17 +++++++++++++---- net/nfc/nci/core.c | 16 +++++++--------- net/nfc/nfc.h | 3 ++- 12 files changed, 55 insertions(+), 46 deletions(-) -- 2.43.0