Tracker / CVE-2021-47652
CVE-2021-47652
Medium 5.5
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe() I got a null-ptr-deref report: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:fb_destroy_modelist+0x38/0x100 ... Call Trace: ufx_usb_probe.cold+0x2b5/0xac1 [smscufx] usb_probe_interface+0x1aa/0x3c0 [usbcore] really_probe+0x167/0x460 ... ret_from_fork+0x1f/0x30 If fb_alloc_cmap() fails in ufx_usb_probe(), fb_destroy_modelist() will be called to destroy modelist in the error handling path. But modelist has not been initialized yet, so it will result in null-ptr-deref. Initialize modelist before calling fb_alloc_cmap() to fix this bug.
Affected products and versions
| linux | linux_kernel · 3.2 → 4.9.311 |
|---|---|
| linux | linux_kernel · 4.10 → 4.14.276 |
| linux | linux_kernel · 4.15 → 4.19.238 |
| linux | linux_kernel · 4.20 → 5.4.189 |
| linux | linux_kernel · 5.11 → 5.15.33 |
| linux | linux_kernel · 5.16 → 5.16.19 |
| linux | linux_kernel · 5.17 → 5.17.2 |
| linux | linux_kernel · 5.5 → 5.10.110 |
Analysis
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