CVE-2022-49741 in Linux
Riassunto
di VulDB • 20/06/2026
Nel kernel Linux, è stata risolta la seguente vulnerabilità:
fbdev: smscufx: correzione del codice di gestione degli errori in ufx_usb_probe
Il codice di gestione degli errori corrente in ufx_usb_probe presenta numerosi problemi di incoerenza, ad esempio la mancanza di ufx_free_usb_list, l'etichetta destroy_modedb dovrebbe includere solo framebuffer_release, e fb_dealloc_cmap corrisponde solo a fb_alloc_cmap.
Il mio syzkaller locale segnala un bug di memory leak:
memory leak in ufx_usb_probe
BUG: memory leak oggetto non referenziato 0xffff88802f879580 (dimensione 128): comm "kworker/0:7", pid 17416, jiffies 4295067474 (età 46.710s) dump esadecimale (primi 32 byte): 80 21 7c 2e 80 88 ff ff 18 d0 d0 0c 80 88 ff ff .!|............. 00 d0 d0 0c 80 88 ff ff e0 ff ff ff 0f 00 00 00 ................ backtrace: [] kmalloc_trace+0x20/0x90 mm/slab_common.c:1045
[] kmalloc include/linux/slab.h:553 [inline]
[] kzalloc include/linux/slab.h:689 [inline]
[] ufx_alloc_urb_list drivers/video/fbdev/smscufx.c:1873 [inline]
[] ufx_usb_probe+0x11c/0x15a0 drivers/video/fbdev/smscufx.c:1655
[] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
[] call_driver_probe drivers/base/dd.c:560 [inline]
[] really_probe+0x12d/0x390 drivers/base/dd.c:639
[] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:778
[] driver_probe_device+0x2a/0x120 drivers/base/dd.c:808
[] __device_attach_driver+0xf7/0x150 drivers/base/dd.c:936
[] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
[] __device_attach+0x105/0x2d0 drivers/base/dd.c:1008
[] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:487
[] device_add+0x642/0xdc0 drivers/base/core.c:3517
[] usb_set_configuration+0x8ef/0xb80 drivers/usb/core/message.c:2170
[] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
[] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
[] call_driver_probe drivers/base/dd.c:560 [inline]
[] really_probe+0x12d/0x390 drivers/base/dd.c:639
[] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:778
Risolvere questo bug riscrivendo il codice di gestione degli errori in ufx_usb_probe.
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