Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
wifi: rtw88: pci: fix resource leak on failed NAPI setup
rtw_pci_probe() allocates PCI resources through rtw_pci_setup_resource() before it sets up NAPI. If rtw_pci_napi_init() fails, the error path jumps straight to err_pci_declaim and skips rtw_pci_destroy(), leaving the PCI resources allocated by rtw_pci_setup_resource() behind.
Add a dedicated cleanup label for the NAPI setup failure path so probe destroys the PCI resources.
The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing current mainline kernels. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc7.
An x86_64 allyesconfig build showed no new warnings. As we do not have a suitable rtw88 PCI board to test with, no runtime testing was able to be performed.
Details
- Affected product:
- Debian 10 ELS , Debian 11 ELS
- Affected packages:
- linux @ 4.19.0 (+1 more)