CVE-2021-47521 Information

Description

In the Linux kernel the following vulnerability has been resolved:

can: sja1000: fix use after free in ems_pcmcia_add_card()

If the last channel is not available then \dev\ is freed. Fortunately we can just use \pdev->irq\ instead.

Also we should check if at least one channel was set up.

Reference

https://git.kernel.org/stable/c/cbd86110546f7f730a1f5d7de56c944a336c15c4 https://git.kernel.org/stable/c/1dd5b819f7e406dc15bbc7670596ff25261aaa2a https://git.kernel.org/stable/c/c8718026ba287168ff9ad0ccc4f9a413062cba36 https://git.kernel.org/stable/c/ccf070183e4655824936c0f96c4a2bcca93419aa https://git.kernel.org/stable/c/1a295fea90e1acbe80c6d4940f5ff856edcd6bec https://git.kernel.org/stable/c/923f4dc5df679f678e121c20bf2fd70f7bf3e288 https://git.kernel.org/stable/c/474f9a8534f5f89841240a7e978bafd6e1e039ce https://git.kernel.org/stable/c/3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45