In the Linux kernel, the following vulnerability has been resolved: devlink: fix xa_alloc_cyclic() error handling In case of returning 1 from xa_alloc_cyclic() (wrapping) ERR_PTR(1) will be returned, which will cause IS_ERR() to be false. Which can lead to dereference not allocated pointer (rel). Fix it by checking if err is lower than zero. This wasn't found in real usecase, only noticed. Credit to Pierre.
https://git.kernel.org/stable/c/f8aaa38cfaf6f20afa4db36b6529032fb69165dc
https://git.kernel.org/stable/c/f3b97b7d4bf316c3991e5634c9f4847c2df35478
https://git.kernel.org/stable/c/466132f6d28a7e47a82501fe1c46b8f90487412e