IT

Tracker / CVE-2021-47631

CVE-2021-47631

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: ARM: davinci: da850-evm: Avoid NULL pointer dereference With 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 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0 The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall(). Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.

Affected products and versions

linux linux_kernel
linux linux_kernel · 2.6.33 → 4.9.311
linux linux_kernel · 4.10 → 4.14.276
linux linux_kernel · 4.15 → 4.19.239
linux linux_kernel · 4.20 → 5.4.190
linux linux_kernel · 5.11 → 5.15.35
linux linux_kernel · 5.16 → 5.17.4
linux linux_kernel · 5.5 → 5.10.112

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References