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Thu, 02 Apr 2026 13:59:59 -0700 (PDT) Date: Thu, 2 Apr 2026 13:59:59 -0700 From: Joe Damato To: David Carlier Cc: horatiu.vultur@microchip.com, UNGLinuxDriver@microchip.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] net: lan966x: fix page_pool error handling in lan966x_fdma_rx_alloc_page_pool() Message-ID: Mail-Followup-To: Joe Damato , David Carlier , horatiu.vultur@microchip.com, UNGLinuxDriver@microchip.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260402172823.83467-1-devnexen@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260402172823.83467-1-devnexen@gmail.com> On Thu, Apr 02, 2026 at 06:28:23PM +0100, David Carlier wrote: > page_pool_create() can return an ERR_PTR on failure. The return value > is used unconditionally in the loop that follows, passing the error > pointer through xdp_rxq_info_reg_mem_model() into page_pool_use_xdp_mem(), > which dereferences it, causing a kernel oops. > > Add an IS_ERR check after page_pool_create() to return early on failure. > > Fixes: 11871aba1974 ("net: lan96x: Use page_pool API") > Cc: stable@vger.kernel.org > Signed-off-by: David Carlier > --- > drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c | 3 +++ > 1 file changed, 3 insertions(+) Reviewed-by: Joe Damato