HID: wacom: fix when get product name maybe null pointer

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: wacom: fix when get product name maybe null pointer Due to incorrect dev->product reporting by certain devices, null pointer dereferences occur when dev->product is empty, leading to potential system crashes. This issue was found on EXCELSIOR DL37-D05 device with Loongson-LS3A6000-7A2000-DL37 motherboard. Kernel logs: [ 56.470885] usb 4-3: new full-speed USB device number 4 using ohci-pci [ 56.671638] usb 4-3: string descriptor 0 read error: -22 [ 56.671644] usb 4-3: New USB device found, idVendor=056a, idProduct=0374, bcdDevice= 1.07 [ 56.671647] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 56.678839] hid-generic 0003:056A:0374.0004: hiddev0,hidraw3: USB HID v1.10 Device [HID 056a:0374] on usb-0000:00:05.0-3/input0 [ 56.697719] CPU 2 Unable to handle kernel paging request at virtual address 0000000000000000, era == 90000000066e35c8, ra == ffff800004f98a80 [ 56.697732] Oops[#1]: [ 56.697734] CPU: 2 PID: 2742 Comm: (udev-worker) Tainted: G OE 6.6.0-loong64-desktop #25.00.2000.015 [ 56.697737] Hardware name: Inspur CE520L2/C09901N000000000, BIOS 2.09.00 10/11/2024 [ 56.697739] pc 90000000066e35c8 ra ffff800004f98a80 tp 9000000125478000 sp 900000012547b8a0 [ 56.697741] a0 0000000000000000 a1 ffff800004818b28 a2 0000000000000000 a3 0000000000000000 [ 56.697743] a4 900000012547b8f0 a5 0000000000000000 a6 0000000000000000 a7 0000000000000000 [ 56.697745] t0 ffff800004818b2d t1 0000000000000000 t2 0000000000000003 t3 0000000000000005 [ 56.697747] t4 0000000000000000 t5 0000000000000000 t6 0000000000000000 t7 0000000000000000 [ 56.697748] t8 0000000000000000 u0 0000000000000000 s9 0000000000000000 s0 900000011aa48028 [ 56.697750] s1 0000000000000000 s2 0000000000000000 s3 ffff800004818e80 s4 ffff800004810000 [ 56.697751] s5 90000001000b98d0 s6 ffff800004811f88 s7 ffff800005470440 s8 0000000000000000 [ 56.697753] ra: ffff800004f98a80 wacom_update_name+0xe0/0x300 [wacom] [ 56.697802] ERA: 90000000066e35c8 strstr+0x28/0x120 [ 56.697806] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE) [ 56.697816] PRMD: 0000000c (PPLV0 +PIE +PWE) [ 56.697821] EUEN: 00000000 (-FPE -SXE -ASXE -BTE) [ 56.697827] ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7) [ 56.697831] ESTAT: 00010000 [PIL] (IS= ECode=1 EsubCode=0) [ 56.697835] BADV: 0000000000000000 [ 56.697836] PRID: 0014d000 (Loongson-64bit, Loongson-3A6000) [ 56.697838] Modules linked in: wacom(+) bnep bluetooth rfkill qrtr nls_iso8859_1 nls_cp437 snd_hda_codec_conexant snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore input_leds mousedev led_class joydev deepin_netmonitor(OE) fuse nfnetlink dmi_sysfs ip_tables x_tables overlay amdgpu amdxcp drm_exec gpu_sched drm_buddy radeon drm_suballoc_helper i2c_algo_bit drm_ttm_helper r8169 ttm drm_display_helper spi_loongson_pci xhci_pci cec xhci_pci_renesas spi_loongson_core hid_generic realtek gpio_loongson_64bit [ 56.697887] Process (udev-worker) (pid: 2742, threadinfo=00000000aee0d8b4, task=00000000a9eff1f3) [ 56.697890] Stack : 0000000000000000 ffff800004817e00 0000000000000000 0000251c00000000 [ 56.697896] 0000000000000000 00000011fffffffd 0000000000000000 0000000000000000 [ 56.697901] 0000000000000000 1b67a968695184b9 0000000000000000 90000001000b98d0 [ 56.697906] 90000001000bb8d0 900000011aa48028 0000000000000000 ffff800004f9d74c [ 56.697911] 90000001000ba000 ffff800004f9ce58 0000000000000000 ffff800005470440 [ 56.697916] ffff800004811f88 90000001000b98d0 9000000100da2aa8 90000001000bb8d0 [ 56.697921] 0000000000000000 90000001000ba000 900000011aa48028 ffff800004f9d74c [ 56.697926] ffff8000054704e8 90000001000bb8b8 90000001000ba000 0000000000000000 [ 56.697931] 90000001000bb8d0 ---truncated---