ring_buffer: Do not deactivate non-existant pages

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rb_head_page_deactivate() expects cpu_buffer to contain a valid list of
->pages, so verify that the list is actually present before calling it.

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

Link: https://lkml.kernel.org/r/20221114143129.3534443-1-d-tatianin@yandex-team.ru

Cc: stable@vger.kernel.org
Fixes: 77ae365eca ("ring-buffer: make lockless")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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Daniil Tatianin 2022-11-14 17:31:29 +03:00 • committed by Steven Rostedt (Google)

parent bcea02b096

commit 56f4ca0a79

1 changed files with 2 additions and 2 deletions

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kernel/trace/ring_buffer.c

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