### [CVE-2021-47631](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47631)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=2.6.33%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=bae105879f2f2404155da6f50b3636193d228a62%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=blue)

### Description

In the Linux kernel, the following vulnerability has been resolved:ARM: davinci: da850-evm: Avoid NULL pointer dereferenceWith newer versions of GCC, there is a panic in da850_evm_config_emac()when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:Unable to handle kernel NULL pointer dereference at virtual address 00000020pgd = (ptrval)[00000020] *pgd=00000000Internal error: Oops: 5 [#1] PREEMPT ARMModules linked in:CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1Hardware name: Generic DT based systemPC is at da850_evm_config_emac+0x1c/0x120LR is at do_one_initcall+0x50/0x1e0The emac_pdata pointer in soc_info is NULL because davinci_soc_info onlygets populated on davinci machines but da850_evm_config_emac() is calledon all machines via device_initcall().Move the rmii_en assignment below the machine check so that it is onlydereferenced when running on a supported SoC.

### POC

#### Reference
- https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b

#### Github
No PoCs found on GitHub currently.