linux-cve-announce - CVE-2025-21747: drm/ast: astdp: Fix timeout for enabling video signal

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Message-ID: <2025022601-CVE-2025-21747-a514@gregkh>
Date: Wed, 26 Feb 2025 18:11:29 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21747: drm/ast: astdp: Fix timeout for enabling video signal

Description
===========

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

drm/ast: astdp: Fix timeout for enabling video signal

The ASTDP transmitter sometimes takes up to 1 second for enabling the
video signal, while the timeout is only 200 msec. This results in a
kernel error message. Increase the timeout to 1 second. An example
of the error message is shown below.

[  697.084433] ------------[ cut here ]------------
[  697.091115] ast 0000:02:00.0: [drm] drm_WARN_ON(!__ast_dp_wait_enable(ast, enabled))
[  697.091233] WARNING: CPU: 1 PID: 160 at drivers/gpu/drm/ast/ast_dp.c:232 ast_dp_set_enable+0x123/0x140 [ast]
[...]
[  697.272469] RIP: 0010:ast_dp_set_enable+0x123/0x140 [ast]
[...]
[  697.415283] Call Trace:
[  697.420727]  <TASK>
[  697.425908]  ? show_trace_log_lvl+0x196/0x2c0
[  697.433304]  ? show_trace_log_lvl+0x196/0x2c0
[  697.440693]  ? drm_atomic_helper_commit_modeset_enables+0x30a/0x470
[  697.450115]  ? ast_dp_set_enable+0x123/0x140 [ast]
[  697.458059]  ? __warn.cold+0xaf/0xca
[  697.464713]  ? ast_dp_set_enable+0x123/0x140 [ast]
[  697.472633]  ? report_bug+0x134/0x1d0
[  697.479544]  ? handle_bug+0x58/0x90
[  697.486127]  ? exc_invalid_op+0x13/0x40
[  697.492975]  ? asm_exc_invalid_op+0x16/0x20
[  697.500224]  ? preempt_count_sub+0x14/0xc0
[  697.507473]  ? ast_dp_set_enable+0x123/0x140 [ast]
[  697.515377]  ? ast_dp_set_enable+0x123/0x140 [ast]
[  697.523227]  drm_atomic_helper_commit_modeset_enables+0x30a/0x470
[  697.532388]  drm_atomic_helper_commit_tail+0x58/0x90
[  697.540400]  ast_mode_config_helper_atomic_commit_tail+0x30/0x40 [ast]
[  697.550009]  commit_tail+0xfe/0x1d0
[  697.556547]  drm_atomic_helper_commit+0x198/0x1c0

This is a cosmetical problem. Enabling the video signal still works
even with the error message. The problem has always been present, but
only recent versions of the ast driver warn about missing the timeout.

The Linux kernel CVE team has assigned CVE-2025-21747 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.13 with commit 4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f and fixed in 6.13.3 with commit 589839379031cce220c9cab9f27cb5477195067e
	Issue introduced in 6.13 with commit 4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f and fixed in 6.14-rc2 with commit fd39c41bcd82d5ebaaebadb944eab5598c668a90

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-21747
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/ast/ast_dp.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/589839379031cce220c9cab9f27cb5477195067e
	https://git.kernel.org/stable/c/fd39c41bcd82d5ebaaebadb944eab5598c668a90