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Change History

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

mm, slab: clean up slab->obj_exts always

When memory allocation profiling is disabled at runtime or due to an
error, shutdown_mem_profiling() is called: slab->obj_exts which
previously allocated remains.
It won't be cleared by unaccount_slab() because of
mem_alloc_profiling_enabled() not true. It's incorrect, slab->obj_exts
should always be cleaned up in unaccount_slab() to avoid following error:

[...]BUG: Bad page state in process...
..
[...]page dumped because: page still charged to cgroup

[[email protected]: fold need_slab_obj_ext() into its only user]

https://git.kernel.org/stable/c/01db0e1a48345aa1937f3bdfc7c7108d03ebcf7e

https://git.kernel.org/stable/c/be8250786ca94952a19ce87f98ad9906448bc9ef

https://git.kernel.org/stable/c/dab2a13059a475b6392550f882276e170fe2fcff