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Change History

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

ring-buffer: Fix possible dereference of uninitialized pointer

There is a pointer head_page in rb_meta_validate_events() which is not
initialized at the beginning of a function. This pointer can be dereferenced
if there is a failure during reader page validation. In this case the control
is passed to "invalid" label where the pointer is dereferenced in a loop.

To fix the issue initialize orig_head and head_page before calling
rb_validate_buffer.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153d

https://git.kernel.org/stable/c/d9942396845fef2369478c157b26738fe07142f6

https://git.kernel.org/stable/c/f1547779402c4cd67755c33616b7203baa88420b