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

KEYS: prevent NULL pointer dereference in find_asymmetric_key()

In find_asymmetric_key(), if all NULLs are passed in the id_{0,1,2}
arguments, the kernel will first emit WARN but then have an oops
because id_2 gets dereferenced anyway.

Add the missing id_2 check and move WARN_ON() to the final else branch
to avoid duplicate NULL checks.

Found by Linux Verification Center (linuxtesting.org) with Svace static
analysis tool.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-47743
• https://git.kernel.org/stable/c/0d3b0706ada15c333e6f9faf19590ff715e45d1e
• https://git.kernel.org/stable/c/13b5b401ead95b5d8266f64904086c55b6024900
• https://git.kernel.org/stable/c/3322fa8f2aa40b0b3651034cd541647a600cc6c0
• https://git.kernel.org/stable/c/70fd1966c93bf3bfe3fe6d753eb3d83a76597eef
• https://git.kernel.org/stable/c/a3765b497a4f5224cb2f7a6a2d3357d3066214ee