Vulnerability CVE-2024-36890
Published: 2024-05-30

Description:
In the Linux kernel, the following vulnerability has been resolved:

mm/slab: make __free(kfree) accept error pointers

Currently, if an automatically freed allocation is an error pointer that
will lead to a crash. An example of this is in wm831x_gpio_dbg_show().

171 char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
172 if (IS_ERR(label)) {
173 dev_err(wm831x->dev, "Failed to duplicate label\n");
174 continue;
175 }

The auto clean up function should check for error pointers as well,
otherwise we're going to keep hitting issues like this.

 References:
https://git.kernel.org/stable/c/9f6eb0ab4f95240589ee85fd9886a944cd3645b2
https://git.kernel.org/stable/c/ac6cf3ce9b7d12acb7b528248df5f87caa25fcdc
https://git.kernel.org/stable/c/79cbe0be6c0317b215ddd8bd3e32f0afdac48543
https://git.kernel.org/stable/c/cd7eb8f83fcf258f71e293f7fc52a70be8ed0128
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