From: Dustin Lundquist Date: Tue, 6 May 2025 18:18:45 +0000 (-0700) Subject: serial: jsm: fix NPE during jsm_uart_port_init X-Git-Tag: v6.14.11~10 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a14c0d2eb3f0b1836fdec22908b87ecffd2ac844;p=thirdparty%2Fkernel%2Fstable.git serial: jsm: fix NPE during jsm_uart_port_init commit e3975aa899c0a3bbc10d035e699b142cd1373a71 upstream. No device was set which caused serial_base_ctrl_add to crash. BUG: kernel NULL pointer dereference, address: 0000000000000050 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 16 UID: 0 PID: 368 Comm: (udev-worker) Not tainted 6.12.25-amd64 #1 Debian 6.12.25-1 RIP: 0010:serial_base_ctrl_add+0x96/0x120 Call Trace: serial_core_register_port+0x1a0/0x580 ? __setup_irq+0x39c/0x660 ? __kmalloc_cache_noprof+0x111/0x310 jsm_uart_port_init+0xe8/0x180 [jsm] jsm_probe_one+0x1f4/0x410 [jsm] local_pci_probe+0x42/0x90 pci_device_probe+0x22f/0x270 really_probe+0xdb/0x340 ? pm_runtime_barrier+0x54/0x90 ? __pfx___driver_attach+0x10/0x10 __driver_probe_device+0x78/0x110 driver_probe_device+0x1f/0xa0 __driver_attach+0xba/0x1c0 bus_for_each_dev+0x8c/0xe0 bus_add_driver+0x112/0x1f0 driver_register+0x72/0xd0 jsm_init_module+0x36/0xff0 [jsm] ? __pfx_jsm_init_module+0x10/0x10 [jsm] do_one_initcall+0x58/0x310 do_init_module+0x60/0x230 Tested with Digi Neo PCIe 8 port card. Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM") Cc: stable Signed-off-by: Dustin Lundquist Link: https://lore.kernel.org/r/3f31d4f75863614655c4673027a208be78d022ec.camel@null-ptr.net Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c index ce0fef7e2c665..be2f130696b3a 100644 --- a/drivers/tty/serial/jsm/jsm_tty.c +++ b/drivers/tty/serial/jsm/jsm_tty.c @@ -451,6 +451,7 @@ int jsm_uart_port_init(struct jsm_board *brd) if (!brd->channels[i]) continue; + brd->channels[i]->uart_port.dev = &brd->pci_dev->dev; brd->channels[i]->uart_port.irq = brd->irq; brd->channels[i]->uart_port.uartclk = 14745600; brd->channels[i]->uart_port.type = PORT_JSM;