ring-buffer: Prevent off-by-one array access in ring_buffer_desc_page()

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As pointed out by Smatch, the ring-buffer descriptor array page_va is
counted by nr_page_va, but the accessor ring_buffer_desc_page() allows
access off by one.

Currently, this does not cause problems, as the page ID always comes
from a trusted source. Nonetheless, ensure robustness and fix the
accessor. While at it, make the page_id unsigned.

Link: https://patch.msgid.link/20260410124527.3563970-1-vdonnefort@google.com
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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Vincent Donnefort 2026-04-10 13:45:27 +01:00 • committed by Steven Rostedt (Google)

parent 1111e9bd83

commit 6170922f13

1 changed files with 2 additions and 2 deletions

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kernel/trace/ring_buffer.c

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