CVE-2021-47652

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()<br /> <br /> I got a null-ptr-deref report:<br /> <br /> BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> ...<br /> RIP: 0010:fb_destroy_modelist+0x38/0x100<br /> ...<br /> Call Trace:<br /> ufx_usb_probe.cold+0x2b5/0xac1 [smscufx]<br /> usb_probe_interface+0x1aa/0x3c0 [usbcore]<br /> really_probe+0x167/0x460<br /> ...<br /> ret_from_fork+0x1f/0x30<br /> <br /> If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will<br /> be called to destroy modelist in the error handling path. But modelist<br /> has not been initialized yet, so it will result in null-ptr-deref.<br /> <br /> Initialize modelist before calling fb_alloc_cmap() to fix this bug.