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Fri, 07 Aug 2026 15:43:19 -0700 (PDT) Date: Fri, 7 Aug 2026 22:43:15 +0000 In-Reply-To: <20260807224315.234152-1-hramamurthy@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260807224315.234152-1-hramamurthy@google.com> X-Mailer: git-send-email 2.55.0.679.g6767b8d81c-goog Message-ID: <20260807224315.234152-3-hramamurthy@google.com> Subject: [PATCH net 2/2] gve: fix NULL dereference due to missing ptp adjfine From: Harshitha Ramamurthy To: netdev@vger.kernel.org Cc: joshwash@google.com, hramamurthy@google.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, richardcochran@gmail.com, thostet@google.com, jordanrhee@google.com, ziweixiao@google.com, willemb@google.com, nktgrg@google.com, pkaligineedi@google.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org Content-Type: text/plain; charset="UTF-8" From: Jordan Rhee Fix NULL dereference due to missing implementation of adjfine, which can be triggered from usermode as follows: sudo ./testptp -d /dev/ptp0 -f 0 [ 551.943697] BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] [ 552.061946] Call Trace: [ 552.064487] [ 552.066681] ptp_clock_adjtime+0x1c0/0x2c0 [ 552.070874] ? get_clock_desc+0x6b/0xb0 [ 552.074825] pc_clock_adjtime+0x78/0xc0 [ 552.078755] __do_sys_clock_adjtime+0x85/0x110 [ 552.083293] do_syscall_64+0xea/0x610 Cc: stable@vger.kernel.org Fixes: acd16380523b ("gve: Add initial PTP device support") Signed-off-by: Jordan Rhee Signed-off-by: Harshitha Ramamurthy --- drivers/net/ethernet/google/gve/gve_ptp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/google/gve/gve_ptp.c b/drivers/net/ethernet/google/gve/gve_ptp.c index 06b1cf4a5efc..1d6c59f4ead3 100644 --- a/drivers/net/ethernet/google/gve/gve_ptp.c +++ b/drivers/net/ethernet/google/gve/gve_ptp.c @@ -26,6 +26,11 @@ int gve_clock_nic_ts_read(struct gve_priv *priv) return 0; } +static int gve_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + return -EOPNOTSUPP; +} + static int gve_ptp_gettimex64(struct ptp_clock_info *info, struct timespec64 *ts, struct ptp_system_timestamp *sts) @@ -60,6 +65,7 @@ static long gve_ptp_do_aux_work(struct ptp_clock_info *info) static const struct ptp_clock_info gve_ptp_caps = { .owner = THIS_MODULE, .name = "gve clock", + .adjfine = gve_ptp_adjfine, .gettimex64 = gve_ptp_gettimex64, .settime64 = gve_ptp_settime64, .do_aux_work = gve_ptp_do_aux_work, -- 2.55.0.679.g6767b8d81c-goog