Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1)

From	Vincent Lefevre <vincent@vinc17.net>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1)
Date	2026-01-20 18:10 +0100
Message-ID	<MfnoR-bZaX-15@gated-at.bofh.it> (permalink)
References	(2 earlier) <LAos9-1uRl-1@gated-at.bofh.it> <LVn85-fUwW-11@gated-at.bofh.it> <MbeNb-9dpE-3@gated-at.bofh.it> <LAos9-1uRl-1@gated-at.bofh.it> <MbeNb-9dpE-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi Salvatore,

On 2026-01-09 06:38:39 +0100, Salvatore Bonaccorso wrote:
> Were you able to reproduce the issue and if yes test that patch?

Sorry, I could not try yet. This has been a busy period, and still
until at least around February 9.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)

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Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1) Salvatore Bonaccorso <carnil@debian.org> - 2025-11-25 21:10 +0100
  Processed: Re: Bug#1116643: UBSAN: shift-out-of-bounds in  .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-11-25 21:10 +0100
  Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1) Vincent Lefevre <vincent@vinc17.net> - 2025-11-26 13:50 +0100
    Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1) Salvatore Bonaccorso <carnil@debian.org> - 2026-01-09 08:10 +0100
      Bug#1116643: UBSAN: shift-out-of-bounds in .../drivers/gpu/drm/display/drm_dp_mst_topology.c (shift exponent -1) Vincent Lefevre <vincent@vinc17.net> - 2026-01-20 18:10 +0100

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