linux-cve-announce - CVE-2024-56697: drm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps

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Message-ID: <2024122836-CVE-2024-56697-062c@gregkh>
Date: Sat, 28 Dec 2024 10:45:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56697: drm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps_info()

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

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

drm/amdgpu: Fix the memory allocation issue in amdgpu_discovery_get_nps_info()

Fix two issues with memory allocation in amdgpu_discovery_get_nps_info()
for mem_ranges:

 - Add a check for allocation failure to avoid dereferencing a null
   pointer.

 - As suggested by Christophe, use kvcalloc() for memory allocation,
   which checks for multiplication overflow.

Additionally, assign the output parameters nps_type and range_cnt after
the kvcalloc() call to prevent modifying the output parameters in case
of an error return.

The Linux kernel CVE team has assigned CVE-2024-56697 to this issue.


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

	Issue introduced in 6.11 with commit b194d21b9bcc15b50df1bc3ff7428e51c2918a6f and fixed in 6.11.11 with commit d14bea4e094871226ea69772d69dab8b7b5f4915
	Issue introduced in 6.11 with commit b194d21b9bcc15b50df1bc3ff7428e51c2918a6f and fixed in 6.12.2 with commit e8f1dbaa0437eba4e8c1d6a6d81eca2e2ce3d197
	Issue introduced in 6.11 with commit b194d21b9bcc15b50df1bc3ff7428e51c2918a6f and fixed in 6.13-rc1 with commit a1144da794adedb9447437c57d69add56494309d

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-2024-56697
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/amd/amdgpu/amdgpu_discovery.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/d14bea4e094871226ea69772d69dab8b7b5f4915
	https://git.kernel.org/stable/c/e8f1dbaa0437eba4e8c1d6a6d81eca2e2ce3d197
	https://git.kernel.org/stable/c/a1144da794adedb9447437c57d69add56494309d